Features:

--Add support for Exr files which use 32-bit floats for each RGBA channel. Seems to come out too washed out.
--Allow for clearing an individual color curve.
--Allow for saving multiple image types in EmberRender and EmberAnimate. All writes are threaded.
--Remove --bpc command line argument. Add format png16 as a replacement.
--Remove --enable_jpg_comments and --enable_png_comments command line arguments, and replace them with --enable_comments which applies to jpg, png and exr.
--Add menu items to variations and affine spinners which allow for easy entry of specific numeric values like pi.
--Make final render dialog be wider rather than so tall.

Bug fixes:
--Fix some OpenCL compile errors on Mac.
--Remove ability to save bitmap files on all platforms but Windows.

Code changes:
--New dependency on OpenEXR.
--Allow Curves class to interact with objects of a different template type.
--Make m_Curves member of Ember always use float as template type.
--Set the length of the curves array to always be 2^17 which should offer enough precision with new 32-bit float pixel types.
--Set pixel types to always be 32-bit float. This results in a major reduction of code in the final accumulation part of Renderer.h/cpp.
--Remove corresponding code from RendererCL and FinalAccumOpenCLKernelCreator.
--Remove Transparency, NumChannels and BytesPerPixel setters from Renderer.h/cpp.
--Add new global functions to format final image buffers and place all alpha calculation and scaling code in them.
--Blending is no longer needed in OpenGLWidget because of the new pixel type.
--Make new class, AffineDoubleSpinBox.
--Attempt to make file save dialog code work the same on all OSes.
--Remove some unused functions.

Source/Fractorium/OptionsDialog.ui

@@ -424,6 +424,16 @@ in interactive mode for each mouse movement</string>
          </property>
         </widget>
        </item>
+       <item row="4" column="0">
+        <widget class="QCheckBox" name="Png16BitCheckBox">
+         <property name="toolTip">
+          <string>&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p&gt;Save each RGBA component as 16-bits when saving Png files.&lt;/p&gt;&lt;p&gt;This leads to greater color precision for use in high end rendering and display on HDR monitors, however it makes the file size larger.&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
+         </property>
+         <property name="text">
+          <string>Save 16-bit Png</string>
+         </property>
+        </widget>
+       </item>
       </layout>
      </widget>
      <widget class="QWidget" name="OptionsXmlSavingTab">
@@ -846,6 +856,8 @@ in interactive mode for each mouse movement</string>
   <tabstop>TransparencyCheckBox</tabstop>
   <tabstop>ShowAllXformsCheckBox</tabstop>
   <tabstop>ContinuousUpdateCheckBox</tabstop>
+  <tabstop>ToggleTypeCheckBox</tabstop>
+  <tabstop>Png16BitCheckBox</tabstop>
   <tabstop>RandomCountSpin</tabstop>
   <tabstop>ThreadCountSpin</tabstop>
   <tabstop>CpuSubBatchSpin</tabstop>