Update definitions of arbitrary id data items.

[vaitkus]

This PR updates id definitions so they match those in the CIF_CORE dictionary.

Note, that in some cases the assigned source values differ from the default ones, therefore this might conflict with PR #46.

[jamesrhester]

I'm going to guess that existing code has not taken advantage of the freedom offered by the "Text" type and so we can restrict to "Word" type. I would prefer that we bundle these small changes into an email that @brantonc can send to the relevant software authors to double-check that they have no issues.

[vaitkus]

Ok, so this particular change can be summarised as:

The following identifier data items would no longer be allowed to have ASCII whitespaces in their values:

• _atom_site_moment_Fourier.id
• _atom_site_moment_Fourier_param.id
• _parent_propagation_vector.id
• _space_group_magn_ssg_transforms.id
• _space_group_magn_transforms.id
• _space_group_symop_magn_centering.id
• _space_group_symop_magn_og_centering.id
• _space_group_symop_magn_ssg_centering.id
• _space_group_symop_magn_ssg_operation.id

[brantonc]

I support this change. I'm not aware of any software authors for whom this would be a problem.