relax 1.2.3

Description

This is a bug fix release which corrects a segfault crash of the exponential relaxation curve-fitting modules. The bug was introduced by the shift from the makefile to Sconstruct build system. The full descriptions of all bug fixes are:

• Sconstruct now does not use the '-fPIC' option during compilation which caused the exponential relaxation curve-fitting modules to segfault.

• The distribution binary and source file creation Sconstruct functions now properly compress the archives.

• The printout of the relax_fit.select_model function has been fixed.

• The sconstruct script can now execute the fetch_docstrings code. The path previously did not include the current working directory and hence the module could not be imported.

• Unselected residues are now properly ignored for the value.read function as well as all the Dasha functions.

• The value.read function contained a bug where the residue number from the file was not being read. Instead the integer position within the file was being used as the residue number.

• The model-free spectral density function 'calc_S2f_S2s_ts_djw_dS2s' does not exist. Therefore when using the model with the parameters {S_f², S_s², τ_s}, the program would throw an error and stop. The function is actually 'calc_S2f_tf_S2s_ts_djw_dS2s'. The factor 'data.s2f_s2' also had to be calculated in 'maths_fns/jw_mf_comps.py'.