raise errors if zvode fails in mesolve and sesolve
pep8 fixes
use a different initial state to get a more meaning ful correlation test (otherwise the correlation is zero). increase the allowed error to reduced number of false test failures
put initial state back in the ground state to correspond to docstring
Merge pull request #243 from jrjohansson/improve-me-se-zvode-failure-handling

Improve me se zvode failure handling