Alpha3.3

Fixes:
 * the spares container now responds correctly to the distance settings;
 * changed the default max distance to 2m to allow interaction with parts up to 3.75m;
 * tank leaks now ignore empty resources.
 
Improvements:
 * the temperature now makes parts age even when they are not in use;
 * the TemperatureMultiplier is now included in the computation of Lambda for all parts;
 * unmanned command pods don't get spare parts. Supports up to 7 crew members.
 * the atmospheric density is now used as LambdaMultiplier for control surfaces: this means they are less likely to fail at high altitudes.