Ali To DSC Drone Ship Suborbital Hopper V2

An update to the previous craft. Changes:
* Upgraded the 2nd stage engine to hydro-lox, then resized the vehicle down (way, way down).
* Added the code from the Impact Prediction Chip by GoldenShadowGS (also on this site), and modified the ascent code to use this to improve the accuracy of the landing.
* Wrote code to allow the user to offset the target position along the line of flight ("Overshoot"). This allows an easy mechanism to tune the program to deal with atmospheric drag (which the impact prediction code quite properly doesn't try to take into account).
* Added code for a very simplistic suicide burn calculation. It works... Poorly. At least in an atmopshere and with a very heavy lander that whose TWR changes dramatically from the start and end of the landing burn.
* Added loads of comments.

I'm not sure how much improvement is possible beyond this for the "General Case". Obviously, for specific destinations and rockets there is room for improvement, but the changes that work for one craft / origin / destination will make performance worse for a different triplet.

It shouldn't be hard to convert this code to support pinpoint landings, if you wish.