Element failure

Volume element can be deactivated using a failure criterion. This criterion is applied on the FieldApplicator of volume elements. The criterion is defined as:

rc = NamemRuptureCriterion()
rc.put(param, value)
rc.depend(param, fct, Field1D(Lock))
...
app = FieldApplicator(no)        # association to the FieldApplicator number no
app.push(1, SIDE_ID)
app.addRuptureCriterion(rc)

where

`NameRuptureCriterion`	Failure criterion - see Failure criteria
`param`	name of one of the parameters (for example RUPT_CRIT_VAL)
`value`	value of the corresponding parameter
`fct`	Functions y=f(t) whose property depend on (optional, no function if no dependency)
`Field1D(Lock)`	type of dependency of the corresponding property - see Failure criteria (compulsory if there is a dependency)