Update CHANGELOG.txt
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.
fix for not removing completed research from other bases.

but let's leave live alien interrogations alone.
Merge pull request #350 from 54x/master

Updated changelog
ignore clicks with empty crafts for mission to mars.
some base defence fixes

alternate behaviour for getAvailableSoldiers to check for proper conditions
and an heroic variable name to enable it.
fix alien recovery

- treat the north-west corner of the corpse as the corpse, just as the original did
- reversed some of redv's changes to allow for this, but ran with some good ideas.
- fixed bullet sprite for heavy laser... cause that was bugging me, and i was
already in the ruleset.
- fixed silacoid weapon (it should really have a -1 clipSize)
- fixed points totalling for live aliens that have "accidents"
- fixed reapers
add base defense to "new battle mode"

only using the base defined in the ruleset for the time being, with a view
to opening it up a little, maybe we should add the "custom base" builder
here for some... "thorough testing"
and stay down!
place a roof over their heads

i don't even.
Merge branch 'master' of https://github.com/SupSuper/OpenXcom

Conflicts:
	src/Battlescape/DebriefingState.cpp

conflict courtesy of alien defector code, again