Additional functionality to compute and use fisher matrix for stepping
working version of fisher, but needs debugging
fixing parser issues
fixes the crash when one of the diagonal covariance matrix is negative, also the problem with LinAlgError
fix IS for clik, maybe helps #28
cleaned fisher entry in parser
first cleaning
typo in the docs
added bestfit support to fisher
Implement testing version of Fisher matric for starting covmat

* surhudm-2.1:
  added bestfit support to fisher
  first cleaning
  cleaned fisher entry in parser
  fix IS for clik, maybe helps #28
  fixes the crash when one of the diagonal covariance matrix is negative, also the problem with LinAlgError
  fixing parser issues
  working version of fisher, but needs debugging
  Additional functionality to compute and use fisher matrix for stepping