Fixes to darkshadow, assault on unicorn missions

FIXED: cheater's laser cannon (used by Four Winds in darkshadow) had a delay of 850.

Assuming that was supposed to be the range, and gave it the 0.6 delay from the normal laser.  They now pose an actual threat, but are beatable by a cruiser if it can keep them at range.

Changed Assault on Unicorn mission location from Pudas to Amaroq. Pudas is nine jumps away under the new map.