Removed deprecated uses of GEO_AttributeHandle
Fixing deprecation issues with UT_PtrArray
Fixing macro to exclude old files
Fixing use of UT_String tokenizer
Updating GU_CortexPrimitive

Added missing virtual functions, removing deprecated functions, handling changes in GU_ConvertParms, and GU_Primitive factory create signature
Adding friendship with bindings for access to private constructor.

I was never really sure why this wasn't required before, but I guess a gcc 4.4 is a bit pickier
Fixing FromHoudiniGroupConverter tests to account for difference in default attributes
Including SYS_Types to avoid compile issue in H13.0.256
Fixing IMG_DeepShadow interface changes
Using new IMG_DeepPixelWriter
Added TransferSmoothSkinningWeightsOp and test
Addressed notes for TransferSmoothSkinningWeightsOp
Merge pull request #196 from valeriebernard/transferSmoothSkinningWeightsOp

Added TransferSmoothSkinningWeightsOp
Fix for two callbacks defining the same custom attribute

Previously, the attribute would appear twice in attributeNames(). It would get the value from the first callback regardless, but the second attempt to write the value (in the ROP) throws because SceneCache does not accept duplicate sample times for a single attribute.
Fixed exception when trying to read attributes that didn't exist in the underlying scene.
Added GIL release for DisplayDriver imageData and imageClose bindings.

This is necessary for some unit tests I'm currently adding to Gaffer for the Display node. The Gaffer display driver node emits signals (with connected Python slots) on the server thread,
so the GIL must be released on the client thread so that those signals can be processed.

Also removed a couple of unnecessary includes.
Merge pull request #198 from johnhaddon/displayDriverGILRelease

Added GIL release for DisplayDriver imageData and imageClose bindings.
Merge pull request #195 from andrewkaufman/h13Compatibility

Houdini 13 Compatibility
Replacing hasAttribute with try/catch.

Also added todo about performance issues in previous commit
Merge pull request #197 from andrewkaufman/ropAttrFixes

HoudiniScene custom attribute bug fixes