Change: use `load_data` in `ProfileParser` and `PDFParser` to parse data files

[cadenmyers13]

Problem

The current way PDFParser and ProfileParser parse datafiles is archaic.

Proposed solution

Use diffpy.utils new and beautiful load_data function that parses the data more elegantly. Thanks Andrew for the lovely function!

[benfrandsen]

Quick comment on this: In earlier versions, the PDFParser could recognize the standard comments prepended to data files produced on the NOMAD instrument at SNS, such as:

# 5000
# file: PDF/NOM_9999_MnO_5K_ftfrgr.gr
# created: Thu Sep 29 18:48:08 2016
# Comment: neutron, Qmax=31.414, Qdamp=0.017659, Qbroad= 0.0191822
#

The parser would recognize that the scattering type is neutrons and automatically pull out values for Qmax, Qdamp, and Qbroad. In the current version, it does not automatically pull out any of this information, requiring the user to provide it. If possible, please make sure the updated version can still properly parse NOMAD data files.

[cadenmyers13]

@benfrandsen Thank you for catching this! I will get this fixed asap.

[cadenmyers13]

closing as complete

[sbillinge]

I think this is not complete but now resides in issue #206