Excludes asteroids from getting the tank module

Fixes #4 (although Asteroid Cities is now discontinued, this still
applies for any other mod that decides to apply resources to asteroids).
Fixes negative costs

Fixes #65.
Until I can figure out exactly how the cost is computed, then the parts
will have to be full by default.
Re-adds "take spares" click fest

Fixes #67. The system is not configurable yet.
Separates engines and ion engines configs

Also implements fix #66
Updates changelog, version
Merge pull request #70 from Ippo343/Alpha4.4

Alpha 4.4