Fix indexing issues

[taldcroft]

Description

This PR does two things

• Ensure that the row0 and col0 attributes are correct for certain indexing/slicing operations
• Raise IndexError for out-of-bounds index values. Previously a result was returned but it was wrong.

Fixes #168

Interface impacts

Testing

Unit tests

• [x] Mac

  
  (ska3) ➜  chandra_aca git:(fix-indexing-issues) ✗ git rev-parse HEAD          
  81957d9277b286e1a08a003ae3bd82bce4807457
  (ska3) ➜  chandra_aca git:(fix-indexing-issues) pytest
  ===================================================== test session starts =====================================================
  platform darwin -- Python 3.10.8, pytest-7.2.1, pluggy-1.0.0
  rootdir: /Users/aldcroft/git, configfile: pytest.ini
  plugins: timeout-2.1.0, anyio-3.6.2
  collected 204 items                                                                                                           

chandra_aca/tests/test_aca_image.py ................ [ 7%] chandra_aca/tests/test_all.py ........................ [ 19%] chandra_aca/tests/test_attitude.py ............................................................. [ 49%] chandra_aca/tests/test_dark_model.py .... [ 51%] chandra_aca/tests/test_drift.py .......................... [ 64%] chandra_aca/tests/test_maude_decom.py .................. [ 73%] chandra_aca/tests/test_planets.py ............... [ 80%] chandra_aca/tests/test_psf.py ... [ 81%] chandra_aca/tests/test_residuals.py ss... [ 84%] chandra_aca/tests/test_star_probs.py ................................ [100%]

=============================================== 202 passed, 2 skipped in 43.65s ===============================================

Independent check of unit tests by [REVIEWER NAME]
- [ ] [PLATFORM]:

### Functional tests
<!-- Describe and document results of any functional tests, otherwise leave the text below -->
No functional testing.