Support launching satellites into Solar orbit

[ElWanderer]

Not quite the same as inter-planetary transfers.

The existing libraries and boot scripts are almost able to do this, but there are some things to fix first - e.g. there is no sanity check (destHASBODY) prior to calling dest:BODY, which crashes if the destination is the Sun.

It's possible to rig up a solar satellite boot script by making a few alterations to KMSat.ks.

[ElWanderer]

Notes after that submission:

• the new boot script doesn't handle staging during burns (which may be necessary for some Solar orbits), but this is easily fixed
• the new boot script doesn't time a launch, so it may place the Solar apoapsis in completely the wrong place. This is tricky, but: 1) if the relative inclination (between the orbit of the body we're launching from and the target Solar orbit) is very low, we want to launch when the planet is in opposition to either the desired Solar apoapsis or Solar periapsis (depending on whether the target orbit is higher or lower than our departure point). This would be the most efficient, as it would make the biggest burn in low orbit of the planet, potentially at the cost of a long wait (i.e. up to half a year). Alternatively, we could launch immediately, if we can calculate what Solar altitude to transfer to at this point in the orbit. 2) If the relative inclination is not low, we need to launch so that we are aligned with an ascending or descending node (and calculate the solar altitude we would need to burn to). Again, there would be a wait prior to launch but this is preferable to longer waits in orbit and larger inclination changes...
• the "circularisation" burn at periapsis that lib_transfer.ks tries to perform is weird and unnecessary... (and fixed by the following submission)

A temporary version that enables staging and doesn't try to do a circularisation burn works... (after making some corresponding changes to lib_orbit_match.ks and lib_orbit_change.ks) but may require a very overpowered rocket! The game generated a fairly evil orbit (Solar orbit, 41x27Gm, inclination -174 degrees) that I have managed to fulfil, but my rocket needed about 17km/s (and had only 50m/s left over) due to the inefficiency of the initial orbit (putting the apoapsis in completely the wrong place).

[ElWanderer]

Another problem - Kerbin's orbit is a pure circle, so our calcTa() function, called from taAt(), falls over when trying to determine where it is. In this case, we can cheat slightly, and use ORBIT:TRUEANOMALY to get the current anomaly, knowing it will advance at a constant rate over the period of an orbit.