Fix for Hungarian language rules.

Returning RusianRules instance does not work... who knew!
Merge pull request #336 from karvanit/TranslatorFriendlyCode

Fix for Hungarian language rules.
more terror site fixes.

forgot to account for my inability to do basic math.
fix for farmyard terrain.

gotta reset them blocks!
GRAV_SHIELD - Polish translation
Merge pull request #339 from radius75/Polish_t

GRAV_SHIELD - Polish translation
small changes in cursor behaviour.

the selection box will now disappear when the cursor moves over the control
panel, in an effort to reduce accidental misclicks.

the selected unit arrow will no longer be occluded by ANYTHING.
i think this is some sort of falling code.

it looks as though there's a bunch of other stuff in there too..
i kinda remember something about weird pathfinding when going up stairs,
oh yeah, and i think i streamlined something so that it doesn't iterate
for large units.

not sure, pretty tired. leave a message on the forums to let me know what
i broke.
another fix for reapers.
!= != ==
Merge branch 'master' of https://github.com/SupSuper/OpenXcom
- battlescape selection cursor level is in the middle of box (was at ground level)
- explosion blockage reverted to block by destination object, not origin
- power source explosion strength reverted to ufopaedia values