#76 LocalEcliptic for Stars

[Selden Ball]

Please implement a LocalEcliptic directive (with appropriate arguments) for use in STC files. It would define the reference ecliptic for the the SSC declarations for the Star's planets. This would greatly reduce the amount of work needed to define planetary systems which are not aligned with the Earth's ecliptic. It also would make PrecessingRotation usable in planetary systems other than our own.