Merge branch '320_menu_reorganization'
* 320_menu_reorganization:
New "Panel options" configuration dialog is fully described.
New "Layout" configuration dialog is fully described.
New "Configuration options" dialog is fully described.
Some fixes for menu items help.
old_esc_mode option can be setup now in 'Configure options' dialog.
Reorganizing of 'Panel options' configuration dialog.
Applied mouse_scroll_pages option to the mouse wheel.
More options in configure dialogs.
Modified loading/saving panel options.
Configuration dialogs reorganization.
Refactoring of configuration handling.
Added new quick widget: quick_groupbox.
Ticket #320: menu and configuration dialogs reorganization.