pytest issues

[gfabbris]

Addresses two issues that came up with pytest:

• xraylarch had to be updated to the latest version to be compatible with lmfit. It was moved to the pip install section as recommended in their manual.
• pytest is failing during manage_database.to_csv_json, see #56. That section of the test has been commented out.

[codecov-commenter]

Codecov Report

:exclamation: No coverage uploaded for pull request base (expand-plot_2d@4c66664). Click here to learn what that means. The diff coverage is n/a.

@@                Coverage Diff                @@
##             expand-plot_2d      #57   +/-   ##
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  Files                     ?        6           
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  Hits                      ?      421           
  Misses                    ?      707           
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