Needs refactoring!

Implementation of TimeIndependentPDESolver.

This is particularly useful for debugging long simulations which don't
fail soon.

This reverts commit 40379dcf.

- base class with non-virtual destructor causes undefined behaviour
- missing return statements at the end of non-void functions
- missing const before char* function argument
- reordered initialization of class members
- misleading indentation after for statement
- fixed use of uninitialized variables
- fixed unsequenced modification and access to variables (the C++
  standard does not define the evaluation order of operands, so
  expressions with side-effects such as j++ cause undefined behaviour)

Plus the associated revamping of the SolverStarter. Also
ODESolverMonitor has been removed as its functionality has been merged
into the IterativeSolverMonitor.