"Raise" and "Lower Floor/Ceiling to adjacent sector" actions: when the action...

"Raise" and "Lower Floor/Ceiling to adjacent sector" actions: when the action is not able to find suitable height from the elements of the same type, element of opposite type is used instead (damn that's cryptic :) ). Example: when no ceiling lower than lowest in selection was found while lowering selected ceilings, highest floor height of sectors, selected ceilings belong to, will be used instead. Even shorter: these actions can now be used to "close" and "open" doors quickly.