relax SVN archive

Modified the Mf.test_bug_24131_bmrb_deposition system test to check for the RelaxError.

The test results in a RelaxError, as the results file contains no selected spins.

Modified the behaviour of the bmrb.write user function backend for a model-free analysis.

This is in the bmrb_write() method of the model-free analysis API. Deselected spins are now skipped
and a check has been added to be sure that spin data has been assembled.

Created a system test for catching bug #24131.

This is the BMRB export failure when the SpinContainer object has no s2 attribute, as reported by
Martin Ballaschk at https://gna.org/bugs/?24131.

Fix for small spin id error in tutorial script.

Adding 2 tutorial scripts.

Adding a tutorial script.

Added spaces to install script for better printing.

When sourcing the scripts, several functions can be performed instead.

Adding checking statements to intstall script.

Splitting deploy script into several small functions.