Added knowledge of virtual size to wx(Scrolled)Windows, they can now

Added knowledge of virtual size to wx(Scrolled)Windows, they can now
manage their own scrollbars with the help of a sizer or other user
clues (SetVirtualSizeHints) without the need for an ancillary container.
Added SetSizerAndFit convenience method.
SetSizer now enables/disables AutoLayout automagically.
Logic bugfix for scrollsub sample.
Syntax bugfix in parser.y.
Compiler warning fix in textctrl.cpp.

 Modified Files:
    docs/latex/wx/scrolwin.tex docs/latex/wx/sizer.tex
    docs/latex/wx/window.tex include/wx/scrolwin.h
    include/wx/sizer.h include/wx/window.h
    include/wx/generic/scrolwin.h include/wx/gtk/scrolwin.h
    samples/scrollsub/scrollsub.cpp src/common/parser.y
    src/common/sizer.cpp src/common/wincmn.cpp
    src/generic/scrlwing.cpp src/gtk/scrolwin.cpp
    src/msw/textctrl.cpp

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@15210 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775