--User changes

-Add new variations: bubbleT3D, crob, hexaplay3D, hexcrop, hexes, hexnix3D, loonie2, loonie3, nBlur, octapol and synth.
 -Allow for pre/post versions of dc_bubble, dc_cylinder and dc_linear whereas before they were omitted.
 -When saving a file with multiple embers in it, detect if time values are all the same and if so, start them at zero and increment by 1 for each ember.
 -Allow for numerous quality increases to be coalesced into one. It will pick up at the end of the current render.
 -Show selection highlight on variations tree in response to mouse hover. This makes it easier to see for which variation or param the current mouse wheel action will apply.
 -Make default temporal samples be 100, whereas before it was 1000 which was overkill.
 -Require the shift key to be held with delete for deleting an ember to prevent it from triggering when the user enters delete in the edit box.
  -This wasn't otherwise fixable without writing a lot more code.

--Bug fixes
 -EmberGenome was crashing when generating a sequence from a source file with more than 2 embers in it.
 -EmberGenome was improperly handling the first frame of a merge after the last frame of the loop.
  -These bugs were due to a previous commit. Revert parts of that commit.
 -Prevent a zoom value of less than 0 when reading from xml.
 -Slight optimization of the crescents, and mask variations, if the compiler wasn't doing it already.
 -Unique file naming was broken because it was looking for _# and the default names ended with -#.
 -Disallow renaming of an ember in the library tree to an empty string.
 -Severe bug that prevented some variations from being read correctly from params generated outside this program.
 -Severe OpenCL randomization bug. The first x coordinates of the first points in the first kernel call of the first ember of a render since the OpenCL renderer object was created were not random and were mostly -1.
 -Severe bug when populating xform selection distributions that could sometimes cause a crash due to roundoff error. Fix by using double.
 -Limit the max number of variations in a random ember to MAX_CL_VARS, which is 8. This ensures they'll look the same on CPU and GPU.
 -Prevent user from saving stylesheet to default.qss, it's a special reserved filename.

--Code changes
 -Generalize using the running sum output point inside of a variation for all cases: pre, reg and post.
 -Allow for array variables in variations where the address of each element is stored in m_Params.
 -Qualify all math functions with std::
 -No longer use our own Clamp() in OpenCL, instead use the standard clamp().
 -Redesign how functions are used in the variations OpenCL code.
 -Add tests to EmberTester to verify some of the new functionality.
 -Place more const and override qualifiers on functions where appropriate.
 -Add a global rand with a lock to be used very sparingly.
 -Use a map instead of a vector for bad param names in Xml parsing.
 -Prefix affine interpolation mode defines with "AFFINE_" to make their purpose more clear.
 -Allow for variations that change state during iteration by sending a separate copy of the ember to each rendering thread.
 -Implement this same functionality with a local struct in OpenCL. It's members are the total of all variables that need to change state within an ember.
 -Add Contains() function to Utils.h.
 -EmberRender: print names of kernels being printed with --dump_kernel option.
 -Clean up EmberTester to handle some of the recent changes.
 -Fix various casts.
 -Replace % 2 with & 1, even though the compiler was likely doing this already.
 -Add new file Variations06.h to accommodate new variations.
 -General cleanup.

Source/Fractorium/QssDialog.cpp

@@ -70,7 +70,6 @@ QssDialog::QssDialog(Fractorium* parent) :
 
 	connect(ui->QssLoadButton, SIGNAL(clicked()), this, SLOT(LoadButton_clicked()), Qt::QueuedConnection);
 	connect(ui->QssSaveButton, SIGNAL(clicked()), this, SLOT(SaveButton_clicked()), Qt::QueuedConnection);
-	connect(ui->QssSaveDefaultButton, SIGNAL(clicked()), this, SLOT(SaveDefaultButton_clicked()), Qt::QueuedConnection);
 	connect(ui->QssBasicButton, SIGNAL(clicked()), this, SLOT(BasicButton_clicked()), Qt::QueuedConnection);
 	connect(ui->QssMediumButton, SIGNAL(clicked()), this, SLOT(MediumButton_clicked()), Qt::QueuedConnection);
 	connect(ui->QssAdvancedButton, SIGNAL(clicked()), this, SLOT(AdvancedButton_clicked()), Qt::QueuedConnection);
@@ -310,7 +309,7 @@ void QssDialog::accept()
 	if (m_Theme)
 		m_Parent->m_Settings->Theme(m_Theme->objectName());
 
-	SaveDefaultButton_clicked();
+	SaveAsDefault();
 	QDialog::accept();
 }
 
@@ -506,11 +505,20 @@ void QssDialog::LoadButton_clicked()
 /// <summary>
 /// Save the stylesheet to disk.
 /// Called when the user clicks the save button.
+/// The user cannot save to default.qss, as it's a special placeholder.
+/// When they exit the dialog by clicking OK, the currently displayed stylesheet
+/// will be saved to default.qss.
 /// </summary>
 void QssDialog::SaveButton_clicked()
 {
 	auto path = SaveFile();
 
+	if (path.toLower().endsWith("default.qss"))
+	{
+		QMessageBox::critical(this, "File save error", "Stylesheet cannot be saved to default.qss. Save it to a different file name, then exit the dialog by clicking OK which will set it as the default.");
+		return;
+	}
+
 	if (!path.isEmpty())
 	{
 		ofstream of(path.toStdString());
@@ -522,16 +530,16 @@ void QssDialog::SaveButton_clicked()
 			of.close();
 		}
 		else
-			QMessageBox::critical(this, "File open error", "Failed to open " + path + ", style will not be set as default");
+			QMessageBox::critical(this, "File save error", "Failed to save " + path + ", style will not be set as default");
 	}
 }
 
 /// <summary>
 /// Save the stylesheet to the default.qss on disk.
 /// This will be loaded the next time Fractorium runs.
-/// Called when the user clicks the save as default button.
+/// Called when the user clicks ok.
 /// </summary>
-void QssDialog::SaveDefaultButton_clicked()
+void QssDialog::SaveAsDefault()
 {
 	auto path = m_Parent->m_SettingsPath + "/default.qss";
 	ofstream of(path.toStdString());
@@ -543,7 +551,7 @@ void QssDialog::SaveDefaultButton_clicked()
 		of.close();
 	}
 	else
-		QMessageBox::critical(this, "File open error", "Failed to open " + path + ", style will not be set as default");
+		QMessageBox::critical(this, "File save error", "Failed to save " + path + ", style will not be set as default");
 }
 
 /// <summary>