Merge branch '2257_disabled_widget'
* 2257_disabled_widget:
Visual improvements of 'Virtual File System Setting' dialog.
Visual improvements of 'Configiration' dialog.
Reimplemented 'Layout' dialog engine.
Some reimplementation of "Listing mode" dialog.
Updated EN and RU man pages.
Added color for disabled widget.
Improvements of QuickDialog engine.
Added parameter to Wbutton callback to get the message sender easy.
Added dlg_find_by_id() function.
Ticket #2257: added capability to interactive enable/disable widgets.