updated two maps, dune_boogie & dead_in_motion rdx
fix combat tank to have no pre-reqs
make starport faster in exchange for costing more
increase turret sight/detection range
increase spread of turrets; gun dmg vs infantry
remove high-tech as pre-requisite for Missile Tank
reduced tank & quad dmg. vs wood & concrete

buildings die too easily.
And turrets need to last longer against tanks, etc.
Merge pull request #3071 from psydev/bleed

Dune 2000 balancing