transient solver with suitable ddtScheme

Functionality to add/problem to solve

Trying to run a transient solver with 'steadyState' as ddtScheme usually causes a divide by zero (sigfpe). This is quite an easy mistake to make when starting from a steady-state solution.

Proposal

Would be nice to give a warning message. It still should be possible in general (e.g. to replace an outer loop with the time loop).

Cross Ref: EP#1204