v2.0.4

TL;DR. This is mostly a bugfix release, with some QOL warnings.

[Features]

• mass_default should be available for any invariant / conditions
• Persistence Matrix update (fixing several bugs with non-simplicial filtrations, and some optimizations)
• more natural choices in signed measures
• Slicer checks to prevent unnecessary computations (and mpfree segfaults)
• Slicer that come from minimal presentation now store their original dimension (under slicer.minpres_degree)
• Some external libraries, e.g., mpfree can break due to a boost update; added a check to remove a cryptic error message

[Bug Fixes]

• Rank invariant wasn't properly recovered in some conditions
• slicers could not be pushed on exact grids
• several other issues related to signed measures computations

[Tests]

• signed measure matrix of tests, and checking different backends (vanilla gudhi, persistence matrices with different options, mpfree)
• checks results with mpfree reductions, when available