Doc updates, wxsizer et al

wxFileDialog displays current dir now,
 wxTipProvider uses statictext for headline
 messagebox (and other) dialogs now always display
   an OK buttons, unless wxYES_NO is given
 Appending a menu to a menu bar after having called
   wxFrame::SetMenuBar() should now work
 Added test to configure so that it correctly sets
  compiler flags etc if GCC is used on Solaris and
  IRIX instead of CC, also changed default shared
  library create to GCC from G++ on some platforms
  (as previously already Linux)


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@3429 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/latex/wx/function.tex

@@ -48,11 +48,12 @@ temporary storage that should not be deallocated.
 
 This function does directory searching; returns the first file
 that matches the path {\it spec}, or the empty string. Use \helpref{wxFindNextFile}{wxfindnextfile} to
-get the next matching file.
+get the next matching file. Neither will report the current directory "." or the
+parent directory "..".
 
 {\it spec} may contain wildcards.
 
-{\it flags} is reserved for future use.
+{\it flags} may be wxDIR for restricting the query to directories, wxFILE for files or zero for either.
 
 For example: