relax SVN archive

Removed a debugging print statement.

Fixed all the calls to sequence.read() where the default residue columns were being relied upon.

Removed the test for error values of zero, as this was killing Dasha!

Fix for the validate_sequence().

The shifted column numbers were not being taken into account.

Added the missing import of read_spin_data_file().

Yet another fix for the new read_spin_data_file() function - hopefully this will be the last!

Fix for the test_read() system test.

The residue columns must now be specified.

Fix for the read() function. The arguments are now properly sent to generate().

Some more fixes for spin_id_to_data_list().

Fixes for spin_id_to_data_list(), and now it returns a tuple rather than a list.