Add star trajectories fitting classes

Description

• Fit is implemented with ODR routine sourced from scipy
• Four fitting modes are implemented :
  • Mispointing simulated in (RA, DEC)[deg] (radec)
  • Mispointing simulated as camera shift in Y[m] (y)
  • Mispointing simulated as camera shift in (X,Y)[m] (xy)
  • Mispointing simulated as camera shift in (X,Y,Z)[m] (xyz)
• Coma aberration corrections are applied as average correction factor
  • Pixels rotation is not accounted for at the moment, TODO
• Results are stored as pandas DataFrame (multiindexed columns) in csv format
• Complete run ('by_run') and per-subrun ('by_subrun') fitting modes are supported
• Option to ignore star positional errors implemented

Related Issue

Closes #4 (closed)

How Has This Been Tested?

Tested locally

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.