thanks to Benjy Cook
well done!

- Fixed the assignment of vertex groups for rectangular leaves. Fix thanks to pawel_xx
- Compressed the UI to make accessing the different parameters easier. Also, the tree is not rebuilt every time a new menu section is accessed.

- Fixed an issue where 'Add New Ivy' and 'Add New Default Ivy' did nothing
- Updated Blender version to 2.59
- Updated Blender revision to 39307

- add option to export root transform only (may help with secondlife compatibility)
- operators are now pep8 compliant.
- frame is set back to the original when export is done.

Fixed a memory access issue on OSX due to getting bezier point's coordinates after a new point was added to the spline. This caused corruption of the tree model.

material.pop(0) into material.pop(0,1)

Based on patch [#28108] by Wintch Analyzer

[[Split portion of a mixed commit.]]

Reported by Tobias Kummer. Thanks! :) 

- added default options for unity3d, can add other defaults too

gives a few % speedup

from John Brown (jcbdigger) 
patch file:
    fbx_xna_unified-2011-08-02a_jcbdigger.patch


Option not to export Default Take

fbx_xna_unified-2011-08-01b_jcbdigger.patch

Only part of this patch has been applied (just the changes to the operator).

from John Brown (jcbdigger)

The patch has been modified, some of the changes I rather see applied as separate patches.

This commit adds/changes:
- Option to export XNA compatible armature rotations.
- Option not to export mesh edges.
- Always export armatures as 'Limb' type.
- dont write default cameras or camera switch when cameras are disabled.
- fix for (harmless) error where armature connections were written out twice.

also made some small style changes and commented unused function.