Refs #8347 Updated system tests and reference results.
Refs #8347 Up system test tolerance.

The errors on the this particular fit are quite high,
but the values themselves are fairly consistent.
Refs #8347 Remove unneeded clean up code.

This code was used to clean up files created by the old Fortran
implementation. It is no longer required in our pure Mantid implementation.
Refs #8347 Updated Bayes system tests with a more sensible run.
Merge remote-tracking branch 'origin/feature/8347_upgrade_jumpfit'