relax SVN archive

Modified parse_token() to handle multiple tokens simultaneously.

Rewrote the tokenise() function to allow for the '&' boolean operator for residues and spins.

This allows ':1&:GLY' or '@453&@N' to be parsed.

Fixed some calls to sequence.read() in the unit tests.

Commented out the header line!

Fix for the spin_id_to_data_list() function.

The spin ID string was incorrectly named.

Converted the sequence.read() user fn to use the new relax_io.read_spin_data_file() function.

Wrote spin_id_to_data_list() to convert a single spin ID into a list of mol, res, and spin names and numbers.

The relax_io.read_spin_data_file() function now calls generic_fns.sequence.validate_sequence().

This is a more advanced check of the sequence information. The validate_sequence() function has
also been modified to handle single data lines.

Bug fix for the relax_io.read_spin_data_file() function.

The column number check was incorrect due to the column renumbering.

Added the missing import of relax_io.read_spin_data_file().