Generic TipTopPSF class for generating then caching PSFs from the UniVie tiptop server

[astronomyk]

Obviously geCluadet, but it seems to do what it claims. I've read every line of code and nothing jumped out as obviously wrong. According to the report, it stress tested also the METIS and MICADO/MORFEO cases, and found a work-around for the bug with the MORFEO ini files (doesn't like the Focuser keywords...)

The result is a new FieldConstantPSF effect that calls the TIPTOP server, and saves the file to disk for later re-use. This doubles the caching, as the tiptop-on-zeus server also caches any PSF it generates. An example of the IRDB effect yamle ntry is:

- name: mavis_tiptop_psf
  class: TipTopPSF
  kwargs:
    instrument: MAVIS               # tiptop_ipy template
    filter_name: "!OBS.filter_name" # one cached PSF per band
    wave_dict: {u: 0.356, B: 0.426, g: 0.470, V: 0.545, r_SDSS: 0.618,
                R: 0.641, i_SDSS: 0.749, I: 0.798, z: 0.895}
    fov_pix: 1024                   # clipped to 1024 max
    pixel_scale: 0.00368            # arcsec; Nyquist for 7.36 mas pixels
    cache_dir: "./tiptop_psf_cache"

I plan to play around with it in a notebook today and then let you know if I find any obvious bugs

[codecov]

Codecov Report

❌ Patch coverage is 15.15152% with 168 lines in your changes missing coverage. Please review.
✅ Project coverage is 29.15%. Comparing base (e386ea5) to head (c66624d).
⚠️ Report is 81 commits behind head on main.

Files with missing lines	Patch %	Lines
scopesim/effects/psfs/tiptop.py	14.72%	168 Missing ⚠️

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HEAD has 174 uploads less than BASE

Flag	BASE (e386ea5)	HEAD (c66624d)
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Additional details and impacted files

@@             Coverage Diff             @@
##             main     #992       +/-   ##
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- Coverage   75.17%   29.15%   -46.03%     
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  Files          70       68        -2     
  Lines        9024     9062       +38     
===========================================
- Hits         6784     2642     -4142     
- Misses       2240     6420     +4180     

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