Fix some deadlock issues

Slower, but much safer internal allocation guard

tests/macros.rs

@@ -0,0 +1,27 @@
+extern crate qadapt;
+
+use qadapt::allocate_panic;
+
+
+#[allocate_panic]
+fn allocates() {
+    let _v: Vec<()> = Vec::with_capacity(1);
+}
+
+#[allocate_panic]
+fn no_allocate() {
+    let _v: Vec<()> = Vec::with_capacity(0);
+}
+
+#[test]
+fn test_no_allocate() {
+    no_allocate();
+}
+
+/*
+#[test]
+#[should_panic]
+fn test_allocates() {
+    allocates();
+}
+*/