Added possibility to turn off convergence checking for displacement or force error (by setting the tolerance to zero). Only relevant errors are printed now (less noisy output if you dont care about displacmeent error)
Modified stationarytransportproblem to treat problems as nonlinear (but the elements still only gives the linear response). Solves linear problems in 1 iteration without needing to specify anything additional in the input files (nrsolver defaults values takes care of it)
Added missing conditionals in nrsolver (when putting in rtolf or rtold = 0.0, turning them off)
Added "X_%d" strings for dofids that go beyond maxdofid (in __DofIDItemToString).