relax SVN archive

If no diffusion tensor is present, creation of diffusion pdb will be skipped.

Corrected placement of seperator (comma).

Opened files are closed properly after writing.

Renamed file parameter.

Converted summary into comma separated file (.csv).

Resultstable generated can be opened in Excel or OpenOffice/LibreOffice.

Added a missing import.

An import for "sys" was missing in "generic_fns/bmrb.py".

Fixed bug 18037 (https://gna.org/bugs/index.php?18037).

A ":" symbol in the description of a function variable was preventing the
compilation of the user manual using scons.

Fix for bug #18030 (https://gna.org/bugs/?18030).

The problem was that the grid search limits were being scaled iteratively for each successive spin
system. This only affects certain type of custom grid searches.

The grace file created by pcs.corr_plot() now separates each element into its own graph.

Bug fix for the N-state model for when only the paramagnetic centre position is optimised.

If the alignment tensor is fixed, as well as the probabilities of the states, then the optimisation
of the paramagnetic centre position was failing as the wrong target function was being used and the
correct one was not set up correctly for this.