Partial implementation of cluster-modelling features

[aymgal]

This PR implements features useful to model galaxy clusters, such as the dPIE profile, a parser for GLEE models, and partial integration of the new multi-plane classes.

After this merge, this branch (dev-cluster-model) will focus solely on continuous developments regarding cluster-scale modelling, and a new PR will be opened to finalize the proper integration of the multi-plane classes within the Herculens class hierarchy.

[coveralls]

Pull Request Test Coverage Report for Build 11707072587

Details

• 57 of 640 (8.91%) changed or added relevant lines in 6 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-1.1%) to 21.405%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
herculens/LensImage/lens_image.py	1	13	7.69%
herculens/MassModel/mass_model.py	19	37	51.35%
herculens/MassModel/mass_model_multiplane.py	0	36	0.0%
herculens/MassModel/Profiles/dpie.py	37	99	37.37%
herculens/LensImage/lens_image_future.py	0	100	0.0%
herculens/Util/glee_util.py	0	355	0.0%

Files with Coverage Reduction	New Missed Lines	%
herculens/MassModel/mass_model.py	1	45.28%

Totals
Change from base Build 11700989694:	-1.1%
Covered Lines:	1584
Relevant Lines:	7400

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💛 - Coveralls