- fix projectile flickering
MORE PATHFINDING CHANGES!

instead of just calculating for the northwest tile, calculate for all
tiles this unit occupies, and divide the result by the same number
haha, oops.
fix for misc gui problems

increased length of DATE text column to allow for estonian translation.
fixed graphs screen title resizing issue
fixes for strafing behaviour
Merge branch 'master' of https://github.com/SupSuper/OpenXcom
re-center camera after reaction fire
Merge branch 'master' of https://github.com/SupSuper/OpenXcom
fix gravity (again)

- fix some theoretical bugs to do with falling that may indeed never occur.
- adjust pathfinder for desert terrain, so it knows when to move up.
- fix units walking into each other on ramps.
- fix TU calculation for desert hills.
- fix path preview when walking on desert hills.
- fix gravity calculations regarding units having the floor blasted out from under them
- fix numerous bugs and streamlined the "we all fall down" state (unitFallBstate)
- small optimization in falling check (no need to calculate for every think() call)
- fix for unit leg movements while landing/taking off
- fix for some theoretical/potential unit placement issues
fix for interceptions not ending when ufo lands.
Merge branch 'master' of https://github.com/SupSuper/OpenXcom
- alien base assault generation fix
- some variables rename