Changes as of Sunday

* Saving FITS files now alternates back and forth between two locations (e.g., drives) for storage leveling and robustness
* Commands now implemented to change Aspect parameters
* New command to suppress the next N telemetry frames (envisioned for use if we find ourselves backlogged with telemetry for whatever reason and are trying to catch up)
* Intended solar target and solar-north orientation now stored in headers
* Calibrated parameters (screen center and clocking angle) now ready to be set using preprocessor definitions
* Code cleanup, especially to reduce redundancy and the number of globals

Merging immediately