* contrib/hbide/setup.ui
+ Started: few more user-definable elements to manage docking
widgets to suit one's preferences.
* contrib/hbide/mainwindow.ui
* contrib/hbide/idedocks.prg
+ Enabled: more options for docking widgets.
Now docks can be placed tabifyied, horizonal to each other,
vertical to each other and/or tabified within its group.
Now user can arrange docks in any area with any combination.
TODO: control this behavior via <setup>, slots are already added.