Fix apply_mask

[mgullik]

This PR fixes the problem with the function apply_mask. Before this fix, the mask was applied only to the _time and _counts attributes when inplace was True. I also modified one test and added a new one to check that apply_mask is applied to all the attributes of the object Lightcurve

[codecov[bot]]

Codecov Report

Merging #712 (68fcb42) into main (fb98a57) will decrease coverage by 0.01%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #712      +/-   ##
==========================================
- Coverage   97.21%   97.20%   -0.01%     
==========================================
  Files          42       42              
  Lines        7797     7805       +8     
==========================================
+ Hits         7580     7587       +7     
- Misses        217      218       +1     

Impacted Files	Coverage Δ
stingray/lightcurve.py	97.83% <100.00%> (-0.13%)	:arrow_down:

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[matteobachetti]

@mgullik thanks for your PR! The failing tests are two minor issues, we recently started to use two new procedures for PRs:

1. Automated code formatting with black: you need to pip install black and run black -l 100 stingray before each commit (VSCode and other editors can do that automatically at each save, I highly recommend it).
2. Creating a changelog entry using towncrier: you need to create a new news fragment in the directory docs/changes/ as explained here: https://github.com/StingraySoftware/stingray/blob/main/docs/changes/README.rst Thanks again!

[mgullik]

Hi @matteobachetti, what do you think? Should I try to improve the coverage of the tests? Let me know

[matteobachetti]

Thanks @mgullik !