Previously, the data validation message popup was not sticking on
reliably on Linux, and flickers very bad on Windows.  That was due to
the painting conflict between the top-most frame window and the grid
window.  By making the message popup window a child window of the
grid window, it paints more reliably.

Part XXIX
Modules
sax, scaddins, sccomp, scripting

This patch fixes the rendering issues in Windows for the new Math symbols for game theory.
The precsim and succsim symbols were truncated. They have been shifted upward.

Part VII
Module
comphelper

Removed erratic loop condition - we simply want to check if any
frame has fullscreen flag set.

For that, moved aImplJavaUtf8TextEncodingData from tables.cxx to
textenc.cxx, as it shares code with aImplUTF8TextEncoding (but does
not drag lots of expensive data back into sal from sal_textenc).

* New build prerequisite doxygen (controllable via --with-doxygen).
* Adapted various headers to slightly different doxygen documentation
  syntax, but much clean up still remains to be done (i.e., warnings
  emitted by doxygen fixed).

svtools/filedlg.hxx(88) : warning C4610: class ´FileDialog´ can never be
instantiated