Added moon-return burns to the Maneuver Planner.
Merge branch 'dev' of https://github.com/MuMech/MechJeb2 into dev
Fixed the LONG standing decoupler auto-staging bug. closes #32
Fix the ascent path texture on relaunch (#27).
Added option to set final Pe after course correction.

Only applies to course corrections that target planets.
Final Pe is only approximate, since it is hard to do the exact calculation.
First pass at smart RCS.
Add a button for enabling all RCS thrusters.
Tweak the interface to the RCS controller.

This lets the RCS controller be used without the docking autopilot interfering.
Smart RCS cleanup.
Calculate RCS throttles in a different thread.
Threading tweaks for RCS balancing.
Fix torque calculation.
Catch and print exceptions in RCSSolverThread.
Fix a race condition.
Normalize target direction and thrust vectors.
Reduce translation error; add tuning parameters.
Minor RCS balancing tweaks.
Clean up RCSSolverThread.
Fix balancing linear thrusters.
UI cleanup.