#2410 fix duplication of code in time stepper, that led to incorrect timestep reporting.

git-svn-id: https://chaste.cs.ox.ac.uk/svn/chaste/trunk@21036 b5f69653-2bf5-0310-8201-b0dafb8e1405
#2426 Attempt to prevent users from raising tickets on their own bugs or, in this case, mixing with genuine bugs. 

git-svn-id: https://chaste.cs.ox.ac.uk/svn/chaste/trunk@21037 b5f69653-2bf5-0310-8201-b0dafb8e1405
#2410 revert as confused by archiving failure...

git-svn-id: https://chaste.cs.ox.ac.uk/svn/chaste/trunk@21038 b5f69653-2bf5-0310-8201-b0dafb8e1405
Fixing Windows build - r21034 and others

git-svn-id: https://chaste.cs.ox.ac.uk/svn/chaste/trunk@21039 b5f69653-2bf5-0310-8201-b0dafb8e1405
#2426 We were already testing for this type of error, but without the higher-level hinting exception.

git-svn-id: https://chaste.cs.ox.ac.uk/svn/chaste/trunk@21040 b5f69653-2bf5-0310-8201-b0dafb8e1405