relax SVN archive

Created two new empty packages data_store.lib and data_store.objects.

The data_store.lib package will be for functions and modules from generic_fns which manipulate the
data store objects, and the data_store.objects package will be for the special objects of the store.

Created the empty lib.chemical_shift package.

Created the empty lib.dispersion package.

Fix for the lib.arg_check module for the shift of check_type module into the lib package.

Moved the check_types module into the lib package.

Shifted the arg_check module to lib.arg_check.

Shifted the target_functions.paramag_centre module to lib.alignment.paramag_centre.

Shifted the target_functions.correlation_time module to lib.diffusion.correlation_time.

Moved the target_functions.weights module to lib.diffusion.weights.

Moved the target_functions.ri_comps module to lib.auto_relaxation.ri_comps.