After every NR step, if linearly-dependent constraints are reinstated, only need to check the active constraints f<0 to check convergence, not all the f.  Fixes #4303
Merge pull request #4304 from WilkAndy/only_act_4303

After every NR step, if linearly-dependent constraints are reinstated, o...
Merge commit 'a0d84433d2992aea1e38a97c6ececd4d82e2d35f'