Merge wxQT branch into the trunk.

This merges in the latest sources from GSoC 2014 wxQt project with just a few
minor corrections, mostly undoing wrong changes to common files in that branch
(results of a previous bad merge?) and getting rid of whitespace-only changes.
Also remove debug logging from wxGrid.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@77455 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/index.htm

@@ -47,6 +47,7 @@
       <a href="mac/readme.txt">wxMac</a>,
       <a href="cocoa/readme.txt">wxCocoa</a>,
       <a href="motif/readme.txt">wxMotif</a>,
+      <a href="qt/readme.txt">wxQt</a>
       <a href="x11/readme.txt">wxX11</a>,
       <a href="univ/readme.txt">Univ</a>
     </li>
@@ -57,6 +58,7 @@
       <a href="x11/install.txt">wxX11</a>,
       <a href="mac/install.txt">wxMac</a>,
       <a href="cocoa/install.txt">wxCocoa</a>,
+      <a href="qt/install.txt">wxQt</a>,
     </li>
     <li><a href="changes.txt"><b>General change log</b></a></li>
     <li>Licence: