More enhancements!

Major notes:
* Camera twist correction is now fully implemented (and is used to account for the 180-degree rotation) (closes #141)
* First-order guesses for calibrated parameters (clocking and optical center) to remove relative differences between PYAS-F and PYAS-R
* GPS info from the FDR is parsed and used (closes #180)
* Added getting commands for solar target X or Y (closes #179)

Merging immediately