Consider removing Feder specific code in stellarphot

[JuanCab]

I poked around and identified the following places where the code either assumes or refers to Feder Observatory in the current version of stellarphot. I found the following:

• [x] photometry.py
  • Assumes only Feder! add_to_photometry_table(): Turns out code only adds BJD field to phot if the observatory is Feder (lines 381-383: Codes for Feder Observatory BJD)
  • find_times(): latitude and longitude defaults to Feder (but does allow other choices)
• [x] visualization/comparison_functions.py is hardcoded for Feder!
  • [x] Assumes only Feder! In ComparisonViewer/_set_object line 513 sets telescope_code for tess_submission to Feder
  • [x] Assumes only Feder! In ComparisonViewer/_make_tess_save_box line 625 sets displayed telescope code to Feder, no other option.
• [x] visualization/seeing_profile_functions.py is hardcoded for Feder!
  • [x] Assumes only Feder! In SeeingProfileWidget/_make_tess_save_box line 447 sets displayed telescope code to Feder, no other option.
  • [x] Assumes only Feder! In SeeingProfileWidget/_update_plots the read noise and gain are set to the values for our camera (CG16M).

    ### Tasks

[JuanCab]

PR #141 and #145 have addressed the first bullet point.

[mwcraig]

Assumes only Feder! In SeeingProfileWidget/_update_plots the read noise and gain are set to the values for our camera (CG16M).

This bit is done in #236

[mwcraig]

Assumes only Feder! In SeeingProfileWidget/_make_tess_save_box line 447 sets displayed telescope code to Feder, no other option.

This is done in #268

[mwcraig]

gui_tools/comparison_functions.py is hardcoded for Feder!

This is also done in #268 now