Merge pull request #36 from lpoujoulat/wxAuiExperimentalFixes

Wx aui experimental fixes
Merge pull request #38 from lpoujoulat/wxAuiExperimentalFixes

Fix re-numbering of panes position. This was preventing them to normally...
Merge pull request #39 from lpoujoulat/wxAuiExperimentalFixes

DetachPane() was not removing all references to the window if the window...
Fix for issue #40: pages of wxAuiNotebook are not always tabs as they should