Use CallOnInit so the extra housekeeping on wxOSX_cocoa will be performed, and apple events will be able to be processed.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxPython/Phoenix/trunk@77975 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Apply patch #16590 to plot.py, removes support for oldnumeric.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxPython/Phoenix/trunk@77976 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Only use CallOnInit the first time, otherwise the 2nd wx.App will block when being constructed.  Fixes hang in unittests.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxPython/Phoenix/trunk@77977 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Add __nonzero__ for wx.Sizer.  Closes #15470

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxPython/Phoenix/trunk@77978 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
cleanup

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxPython/Phoenix/trunk@77979 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775