Removed deprecated stuff in Version3_1 branch

[rapoliveira]

I finished removing all the deprecated functions, arguments and values in Version3_1 branch. Adaptations in the code and in unit tests were necessary in a few cases.

The unit tests keep failing in the same 24 tests as before, mainly in VBBL and PSBL functions (issue #116).

[rpoleski]

Looks good to me.
@jenniferyee Can we merge it to Version3_1 branch?

[jenniferyee]

What kind of checks do we have that all of the deprecated code is removed? For example, in Event, we are removing _apply_fit_blending(). Have we verified that there is no longer any code that calls this? I imagine that if we missed removing some instance of fit_blending, then the error the user would see is that _apply_fit_blending() does not exist, which is not very helpful.

Otherwise, fine.

[rpoleski]

We have tests that pass. They also call ~75% of the code and at some point I've verified that the code not tested is almost exclusively plotting and test of stupid input values. This brings testing of plotting - @rapoliveira can you please run all the examples and check that none of them produces errors? Then we can merge.

[rapoliveira]

My last commit updates the few calls to deprecated functions in the examples.

Examples 01, 08, 13, 15, 16, 19, 20, 21 and 23 produce the same error below, which is not related with my changes.
@jenniferyee, could you check it please?

  File "/Users/raphael/anaconda3/lib/python3.11/site-packages/MulensModel/model.py", line 178, in plot_magnification
    magnification = self.get_magnification(
                    ^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/raphael/anaconda3/lib/python3.11/site-packages/MulensModel/model.py", line 1162, in get_magnification
    magnification = self._get_magnification(
                    ^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/raphael/anaconda3/lib/python3.11/site-packages/MulensModel/model.py", line 1188, in _get_magnification
    magnification = self._magnification_1_source(
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/raphael/anaconda3/lib/python3.11/site-packages/MulensModel/model.py", line 1250, in _magnification_1_source
    return magnification_curve.get_magnification()
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/raphael/anaconda3/lib/python3.11/site-packages/MulensModel/magnificationcurve.py", line 160, in get_magnification
    magnification = self.get_binary_lens_magnification()
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/raphael/anaconda3/lib/python3.11/site-packages/MulensModel/magnificationcurve.py", line 524, in get_binary_lens_magnification
    self._magnification_objects[method].get_magnification()
  File "/Users/raphael/anaconda3/lib/python3.11/site-packages/MulensModel/binarylens.py", line 1311, in get_magnification
    self.source_x, self.source_y, self.trajectory.parameters.rho,
    ^^^^^^^^^^^^^
  File "/Users/raphael/anaconda3/lib/python3.11/site-packages/MulensModel/binarylens.py", line 724, in source_x
    self._source_x = float(self.trajectory.x)
                     ^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: only length-1 arrays can be converted to Python scalars

[rpoleski]

Also note that changing to

self._source_x = self.trajectory.x.copy()

produces a different error:

  File "/home/data/caustic/rpoleski/MulensModel/source/MulensModel/magnificationcurve.py", line 524, in get_binary_lens_magnification
    self._magnification_objects[method].get_magnification()
  File "/home/data/caustic/rpoleski/MulensModel/source/MulensModel/binarylens.py", line 692, in get_magnification
    raise NotImplementedError(
NotImplementedError: This is a placeholder class. Use the child classes.

This error repeats for many examples, so there is probably a single error that causes them. @jenniferyee can you solve it?