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

interface/wx/gauge.h

@@ -15,6 +15,8 @@
 
 // Win32 only, is default (and only) on some other platforms
 #define wxGA_SMOOTH          0x0020
+// QT only, display current completed percentage (text default format "%p%")
+#define wxGA_TEXT            0x0040
 
 /**
     @class wxGauge
@@ -43,6 +45,10 @@
     @style{wxGA_SMOOTH}
            Creates smooth progress bar with one pixel wide update step (not
            supported by all platforms).
+    @style{wxGA_TEXT}
+           Display current completed percentage: text default format "%p%"
+           (only supported in wxQt, may be not available on all platforms).
+           @since 3.1.0
     @endStyleTable
 
     @library{wxcore}