bugfix int he Ref.CloneAtoms() method, which now deepcopies, and added a MergeAtomers function to handy.go, which is not tested
some small fixes to make goQM work
fixed mopac.go to work with the new version of mopac2012 which, for reasons that escape me, has introduced a new, in some cases mandatory, keyword
Implemented API change, now *VecMatrix goes always before Ref
Minor fixes in gonum and gocoord files