MRU panics when calibration file is not found

[kmgill]

Reproduce:

• Delete the navcam flats
• Try to calibrate a navcam
• BOOOM!

This happens when a new cal file is added but /updatemanifest.sh is not run.

[kmgill]

Also when caldata.toml is missing or if user specifies a calibration profile that doesn't exist

[kmgill]

Removed panics and replaced with smarted handling of anyhow::Result

[kmgill]

Completed