Preparing modif-nomodif behaviour in RMSDOmp
RMSDOmp -  Modif-nomodif coded, starting to delete repeated code for
iterative superposition
Iterative superposition now working without repeated code. Starting code
redistribution.
code redistributed and setup.py working
build.py updated to work with new file tree
Functions that can be used in root class have been moved. This makes
easier to add new features. Starting to work in it. superposition with
different fit and calc coordinate sets. Next: get ridd of QCP repeated
code