Ready for 0.6.1 PyPI/GitHub release

[bobleesj]

Release checklist for GitHub contributors

• All PRs/issues attached to the release are merged. Merge Fix bugs to run tutorial CLI, update python, matplotlib API #137
• All the badges on the README are passing.
• License information is verified as correct. If you are unsure, please comment below.
• Locally rendered documentation contains all appropriate pages, including API references (check no modules are
  missing), tutorials, and other human written text is up-to-date with any changes in the code.
• Installation instructions in the README, documentation and on the website (e.g., diffpy.org) are updated and
  tested
• Successfully run any tutorial examples or do functional testing in some other way.
• Grammar and writing quality have been checked (no typos).

@sbillinge Ready for release.

[sbillinge]

Nice checklist! The build failed for some reason though....please see Actions

[bobleesj]

Build failed because setuptools does not like having __init__.py that are same in each folder. Created an PR here:

#139

[sbillinge]

full release sent @bobleesj please check

[bobleesj]

conda-forge review requested: conda-forge/diffpy.srmise-feedstock#3

@sbillinge

[bobleesj]

srmise data/Ag_nyquist_qmax30.gr --no-extract --plot

renders:

Closing- package testing finished!