Created so-called dumb deactivation scheme that can act as a last-resort to finding the active constraints.  Added test using a typical multi-plasticity model used in rock mechanics.  Fixes #4043
Merge pull request #4044 from WilkAndy/dumb_4043

Created so-called dumb deactivation scheme that can act as a last-resort...
Merge commit '1ab7e4da76601e8e314ea64c9382c0769d43cb02'