r21149b
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Critical fixes:
+ Fixed a Suul'ka repair crash.

Other fixes:
+ Restored sound.
+ The add to invoice button now correctly accumulates favorite invoice ships.
+ Stations no longer cause combat rounds versus gate ships.
+ Fixed some pathological combat AI issues that were preventing it
from attacking certain features such as deployted gates.
+ Fixed new Zuul AI slow-boating.
+ Fixed tech tree issue involving Plasma Focusing.

Additions:
+ Added 3-second combat ending warning.
+ Fleets with damaged ships now display red in lists.