Added initial code to enable metropolis minimization criteria
Added early out code to reduce required minimization steps
Tidied storing original PE
Added code to introduce metropolis noise
Corrected some mistakes
Removed warnings from compilation
Removed OpenMM licence chunks from the top of files
Merged in changes for openmm 6
Merge branch 'master' into metropolis
Corrected random number distribution for metropolis roll
Merge pull request #23 from Omegaice/metropolis

Metropolis minimization