Merge branch '120_diff_view'
* 120_diff_view: (22 commits)
Update panels after closing the diff viewer.
Optimization of Diff Viewer construction and destruction.
added diff options dialog
added save/load diffview options.
Modified destroying of WDiff widget.
Repaint screen after encoding change.
Minor clean up.
Added usage of search engine.
added merge mechanism
Add new section [Diff Viewer] in man and built-in help.
Fixes of button bar handling.
buttonbar_call(): don't handle Fx button with non-defined command.
little fixup and optimization
fixed display utf-8 text in 8-bit locale
initial step to multiple encodings support and select codeset.
Fixed segfaults in standalone diff viewer.
src/diffviewer/ydiff.c: use GLib functions more widely.
diffviewer: Added libmc for build depends
Added capability to run MC as standalone diff viewer.
src/diffviewer/ydiff.c: code indentation & cleanup.
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