Panda3D 1.5.4 available

[Stefan]

Panda3D has been updated.

------------------------  RELEASE 1.5.4  ------------------------

This is a bugfix release, fixing the problems found in 1.5.3.

* Fixes packpanda crash
* Linux build accidentally got configured for OpenAL
* EggTexture now writes wrap modes and types correctly.
* Fixes an occasional crash in TextureAttrib
* DirectEntry no longer crashes when moving cursor in a full box
* Several bugs in RigidBodyCombiner fixed
* Normals generated by GeoMipTerrain are now correct
* Bugs fixed in DirectGrid
* Linux users can now use WindowProperties.setParentWindow
* Fmod now compiles on 64-bits
* Fixed several bugs in the API reference generator
* EggNurbsSurface is now exposed to Python
* Fixes a bug in PGButton
* GeoMipTerrain set_heightfield fixed
* Several bugs in the Max exporter:
  - Now generates binormals and tangents
  - Pview output fixed
  - Overwrite confirmation fixed
  - Export type 'Both' now works correctly