multi-component analysis: read file written by contrast calculator

[skrueger111]

Multi-component analysis will have the option to either input partial specific volume, molecular weight, I(0) and delta_rho (contrast) manually or read them from a contrast calculator output file. However, contrast calculator doesn't currently write a single file containing all of these parameters. We don't want the user to have to specify more than one file to read. Thus, contrast calculator will need to write out a SINGLE file containing:

• partial specific volume (of each component)
• molecular weight (of each component)
• delta_rho (for each component) vs fraction D2O
• I(0) vs fraction D2O

[skrueger111]

There are two examples of (future) contrast calculator output files:

sample_contrast_calculator_output_file.txt is intended to be read by the match point, stuhrmann parallel axis and decomposition modules

sample_contrast_calculator_output_file1.txt is used with the stoichiometry module

[skrueger111]

The reading of the contrast calculator output file is going to be handled at the GenApp level. There are open tickets on ehb54/zazzie for this issue. Make sure that the sample contrast calculator output files are also included in those tickets.