Molsystem

* Added properties stored as JSON, which allows, vectors, tensors, etc.

* Handle uncertainties in CIF files expressed as '(x)' at end of value.

* Improved naming of molecule in QCSchema
* Added creation of configurations from QCSchema objects.

2022.11.20 -- Added a method to copy a configuration.
Added a new method to the `system` class, `copy_configuration`, that creates a copy of
the configuration using the same atomset and bonset, but new coordinates and cell so
that any changes to coordinates and cell are not shared between the configurations. By
default it copies the current configuration.

The total charge and multiplicity were not correctly set when creating an Open Babel
molecule.