relax SVN archive

The Ln3+ position optimisation system test has been sped up by decreasing the accuracy.

Fix for the alignment tensor initialisation for when the ID is added to cdp.align_ids.

This was introduced in r11301. cdp.align_ids was not being checked if the align ID already exists.

Added some unit tests for the pseudo-elliptic cosine function.

Added a system test for the back-calculation of PCSs.

Added a severely truncated PDB file for PCS back-calculation with ubiquitin.

Wrote the pcs.back_calc() user function back end.

Initialising and alignment tensor now adds the ID to the alignment ID list.

Fix for the alignment tensor rotation matrix - it is now always in the right handed universe.

Added a system test checking the conversion of alignment tensor to chi tensor.

Major patch for integrating the GUI into the noe calculation.

This patch is from Michael Bieri (https://gna.org/users/michaelbieri) and is from file #9490
(https://gna.org/support/download.php?file_id=9490) attached to task #6847
(https://gna.org/task/?6847).

Changes include:
- output filename can be specified
- folder, where results files will be placed, can be specified
- label of hetero nucleus and proton of peak lists and pdb file can be selected
- sequence is read either by sequence file or pdb file
- removed white spaces and progress output.