DIAZ Jerome authored Oct 28, 2019 and GILLES Sebastien committed Oct 30, 2019

- Switch from an assert for the test to an exception at run time, handle by a singleton which is initiliazed from a value read in the input file.
- Make the field related to the check for inverted elements optional (some tests and models do not require it) and modify testing suite accordingly for the tests for which this option is relevant.

Integrator note: I merged here two commits, as the first one alone didn't compile.