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/qt/readme.txt

@@ -0,0 +1,52 @@
+   Welcome to wxWidgets for Qt
+   ---------------------------
+
+You have downloaded the Qt port of the wxWidgets GUI library.
+
+It is required to use at least Qt 5 and some features are
+only available when using Qt 5.2 or higher. 
+
+More info about the wxWidgets project (including all the
+other ports and version of wxWidgets) can be found at the
+main wxWidgets homepage at:
+
+                  http://www.wxwidgets.org/
+  
+Information on how to install can be found in the file 
+INSTALL.txt, but if you cannot wait, this should work on
+many systems:
+
+    mkdir build_qt
+    cd build_qt
+    ../configure --with-qt
+    make
+    su <type root password>
+    make install
+    ldconfig
+
+Please note that it is strongly advised to build the library in
+a separate directory, as shown above, as it allows you to have
+different builds of it (for example with and without debug) in
+parallel. If you build in the source directory, don't forget to
+do "make clean" before changing the configuration!
+
+When you run into problems, please read the INSTALL.txt and 
+follow those instructions. If you still don't have any success,
+please send a bug report to one of our mailing list, INCLUDING 
+A DESCRIPTION OF YOUR SYSTEM AND YOUR PROBLEM, SUCH AS YOUR 
+VERSION OF GTK, WXGTK, WHAT DISTRIBUTION YOU USE AND WHAT ERROR 
+WAS REPORTED. I know this has no effect, but I tried...
+
+Please send problems concerning installation, feature requests, 
+bug reports or comments to the wxWidgets users list. These can
+be found at http://www.wxwidgets.org and more specifically at 
+http://lists.wxwidgets.org.
+
+wxWidgets doesn't come with any guarantee whatsoever. It 
+might crash your harddisk or destroy your monitor. It doesn't 
+claim to be suitable for any special or general purpose.
+
+  Regards,
+
+    The wxWidgets Team
+