Merge pull request #1 from SupSuper/master

Backporting
Merge remote-tracking branch 'upstream/master'

Backport.
Smooooother Drag Scroll
Oh, and RMB can be used to DragScroll on minimap, again.
fix new battle UFOs on load

not just save ;)
add safety
OpenXcom::SeverityLevel::LOG_DEBUG unavailable there... damn
it is now!
Fix Quick Load without a quicksave crashing game.
Merge pull request #843 from fenyo1/smoothDragScroll

Smooooother Drag Scroll
Tweak comboboxes
fix minimap scrolling
fix autoshot centering thing
fix arrow colour
don't recover ammo from weapons that use themselves as ammo
adjust selection arrow
fix soldiers with a jesus complex
add some missing data

and remove some redundant stuff
fix cancel button
why do math when a const int will do just as well

the math was off anyway.
Fix explosiveEfficacy logic error