Updated doc for wxFileExists()

Corrected redrawing and OpenGl canvas
  Made new font code in utilsunix compile (Why does
    Vadim never need any headers?)


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@3790 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/latex/wx/function.tex

@@ -31,7 +31,8 @@ slashes.
 
 \func{bool}{wxFileExists}{\param{const wxString\& }{filename}}
 
-Returns TRUE if the file exists.
+Returns TRUE if the file exists. It also returns TRUE if the file is
+a directory.
 
 \membersection{::wxFileNameFromPath}