relax SVN archive

The select.interatom and deselect.interatom spin ID arguments can now be set to None.

This allows all interatomic data containers to be either selected or deselected.

Fixes for the _minimise_bc_data() model-free method.

The rdc.read user function can now handle spin IDs in quotation marks.

Converted all RDC data and generations scripts used by the N-state model to the interatom design.

This is the RDC data used in the relax test suite.

Updated the population N-state model system test script to the new interatomic data design.

Fixes for the interatomic_loop() calls in the interatom selection and deselection user functions.

Fixes for the interatomic_loop() iterator when using selection strings.

The previous approach did not work!

Converted the population model RDC test data to the interatomic data design.

The RDC lists now consist of the two spin ID columns and a data column.

Removed the SRLS reference from http://www.nmr-relax.com/refs.html.

Fix for the interatomic data container is_empty() method for the new variables and methods.