relax SVN archive

Bug fix:

The grid search for the tm parameter (either global or local) was only from 6 to 12 ns. This has
been changed to 1 to 12 ns.

Some further fixes to the auto_select fuctionallity. Adds support for
other run types and fixes problem loading relax_fit data

Creating unstable branch to work on fix to bug 5501

The addition of Py_DECREF() calls to try to prevent the memory leak present in the relaxation
curve-fitting C modules.

Reverted the behaviour of gcc compilation so that the -fPIC option is used.

Destoyed the temporary 'c_modules' branch.

Merged the fixes to the relaxation curve-fitting C modules from the 'c_modules' branch to the main
development line '1.2'. Revisions r2386:2390 of 'c_modules' were merged.

A fix for the -fPIC compilation bug (#5473). Some problems remain.

bugfix for bug#5501

Compilation with -fPIC and -pedantic.