Merge branch 'master' of https://github.com/wschreyer/PENTrack
Fixed reading of material properties
Spin flip probability was not read in, introduced in commit
8cd99f2542177327fb7f73233aa40937e0082864.
Changed order of field folding to do derivatives first then field value
The MR variables were added
The MR variables were added
Merge branch 'master' of https://github.com/pramodhyapa/PENTrack