relax SVN archive

Added the support of unassigned peaks in Sparky formatted peak lists.

The unassigned peak show up as '?-?'.

Thanks to Ryan Hoffman and his bug report (https://gna.org/bugs/?11913).

Added the support for when a nmrview peak list contains unassigned peaks.

These peaks have an assignment field as '{}' in the peak list and are now excluded.

Complemented the peak list sample accordingly.

Modified the test_palmer_omp() system test to take into account the bugs fixed in Modelfree 4.20.

Added the framework for a XEasy system test.

Fixed the test for the setting of Sparky and NMRView intensities.

Fixed the column number for the intensity.

Fixed the extraction of the residue number, nucleus name and heteronucleus name.

Added the function for the NMRView peak list header handling.

Fixed a problem raised when the number 0 would be given as relaxation delay.

A delay of 0.0 is now given for the intensities associated with the Sparky peak list.

Added a system test for the reading of a Sparky peak list.

This will help find the problems specific to NMRView peak list support...