relax SVN archive

Switched from a RelaxError to 'non-polymer' for anything that isn't a polymer.

A RelaxWarning is thrown so the user can check for FUBAR entries.

The residue numbers are being stored in self now.

The molecule type is now determined.

Created 2 new functions, get_residue_names() and get_residue_nums().

The _Entity.ID is now created.

Removed some remnant args.

The molecule name is now correctly passed in.

Added the missing _Heteronuclear_xx_list.ID tags.

This was pointed out by Eldon Ulrich <elu att bmrb dot wisc dot edu> in the post at
https://mail.gna.org/public/relax-devel/2009-02/msg00025.html (Message-id:
<49A78ABD.2050505@...>).

Merged revisions 8879 via svnmerge from
svn+ssh://bugman@.../svn/relax/1.3

........
r8879 | bugman | 2009-02-27 14:31:58 +0100 (Fri, 27 Feb 2009) | 5 lines

Allowed molecule.name() to name unnamed molecules.

I.e. the mol_id arg can be None.
........

Removed the useless ri_inc variable.