Changes

Prevent DecelerationBurn from setting the throttle to 0 after PDI
Prevent FinalDescent from warping (this kills the craft)
 (commit: 6aef833)

Change braking burn end altitude to 200m
Change various throttle settings to 0.01F to prevent full engine shutdown.
 (commit: a30d52a)

Deceleration burn warp fixes
Plane change and deorbit burn throttle fixes
 (commit: 94dbb19)

Only warp when angular velocity is near zero
Try to prevent final descent from commanding zero throttle
Added idea about skipping deorbitburn step.
 (commit: 8f6728b)

Attempt to prevent full engine shutdown during vertical final descent.
 (commit: ea9a563)

Make min throttle limiter follow global min throttle limiter
Required helper function to keep the code neater.
 (commit: 8d974b4)

Fix for attitude excursion in vertical descent
 (commit: d23e55e)

Attempt to implement new RequestActiveThrottle API.
Still had to bodge transspdact
 (commit: e227003)

Small untested fix attempt
 (commit: 834f8c5)

That's what I get for not even test compiling. Optional arguments don't work that way in C#
 (commit: b6e7238)

Actually fix engine shutoff
 (commit: 32265bd)

Changes to final descent guidance and throttle logic to fix attitude excursions.
 (commit: 6a986a7)