Move more python code to general header and use in parameter_sweep.py
Use '-' prefix in arguments in argdicts (for consistency)
Add self test for explicit solve of llg, not done for ms yet
Remove bem_field_test self test, redundant

* The energy calculations are equivalent because m is fixed,
  plenty of sphere energy tests so no need for this.
Remove old redundant drivers
Update makefile SUBDIRS variables
Add decoupled magnetostatics test to explicit llg test
Add catch statements to parse.pt to allow it to work for more problem types

Not completely tested yet..
Remove redundant copy of sphere mesh generation code