Make internal damage occur multiple times for very high-damage hits

Missile impacts may now damage several pieces of cargo/equipment
Visual indication of ECM activity - scanner fuzziness
Merge branch 'master' of github.com:OoliteProject/oolite
Register ship forms should return to the interfaces screen when complete
Update changelog
Mousewheel implemented for SDL builds.
Enabled mousewheel use for zooming in and out at the Galactic Chart screen,
merge master