don't let reapers override floater's reaction shots.
cleanup in pathfinding
Large Block limit for maps

should help prevent "unreachable ufo" scenario.
allow for map blocks to have a subtype

allow for landing zones to be used as generic terrain as well.
add a frequency to mapblocks

use it to weigh odds, and to limit how many times a map block may be used.
also a small refactor in the battlescapeGenerator to place the landing sites first.
small refactor in bgen

place all the large modules first, then fill in the gaps.
fix for weird caching issues.

let's hope.
- refactored voxelCheck
- back to cyberdiscs
- user-mode first person shot (invisible units won't appear on screen), plus colorcoded units.
- unit color tweaking for voxel dump and fpslook