Quality module

This module gathers quality measure for mesh cells. Proposed quality measure are based on the choice done in the Verdict Geometric Quality Library: - Stimpson, C. J., Ernst, C. D., Knupp, P., Pébay, P. P., & Thompson, D. (2007). The Verdict library reference manual. Sandia National Laboratories Technical Report, 9. (see https://digital.library.unt.edu/ark:/67531/metadc880826/)