[Dev] wx tarball 31

[David Surovell]

The wx tarball v2.6.2-31 has landed.
The highlights:

wxPython: many more updates, courtesy of Robin Dunn
wxPython: fixed image corruption due to bogus line ending conversion in SVN
wxHTML: refactored
ALL: minor improvements to wxApp exception handling
wxMac, wxGTK: fixed self-inflicted wxMenuItem.SetBitmap problem
wxMac: removed wxDialog and wxTextCtrl grow icons
wxMac: made standard dialogs more visually Mac-conformant
wxMac: added default choice assignment to wxChoice popups
wxMSW: improved toolbar resizing logic
wxMSW: minor improvements to status bar and menu item handling
wxMSW: ***restored OSAF-specific native compositing support removed in 
tarball 30***

Regards,
David S.