* Added tests for subsample optimization

* New subsample_optimization option to match

* testing phase retrieval

* Corrected phase retrieval testing

* Fixed usage of baseline cyclic time shift

* Ran black

on the match and optimization_match functions

* Complying with the 79 character per line limit

* Moved optimized match functionality to own function

Also renamed the function to optimized_match, and fixed docs accordingly

* Matched tests to the new optimized_match API

* Ran black on the new function

* Ran black on the old, modified match funcion

* Ignoring pylint warning

about unbalanced tuple unpacking; it is a false positive

* Now using norms given by the user, if available

* A bodge to solve the pylint false positive

* applying the mask to the frequencies as well

* New tests for optimized match

Now testing:
- optimized match with a given PSD (not None)
- optimized match with high and low frequency constraints

* Conforming optimized_match to pycbc standards

- computing the cutoff indices with get_cutoff_indices
- computing the normalization with sigmasq
- computing the integral with the rectangle rule

* Reformatted optimized_match with

* Fixed line too long