Eval uncertainty dscale

[newville]

change value of step size for derivatives in ModelResult.eval_uncertainty to 0.001.

Type of Changes

• Bug fix
• New feature
• Refactoring / maintenance
• Documentation / examples

Not sure I would call it a bug fix...

Tested on

latest.

Verification

Have you

• included docstrings that follow PEP 257?

• referenced existing Issue and/or provided relevant link to mailing list?

• verified that existing tests pass locally?

• verified that the documentation builds locally?

• squashed/minimized your commits and written descriptive commit messages?

• added or updated existing tests to cover the changes?
• updated the documentation and/or added an entry to the release notes (doc/whatsnew.rst)?
• added an example?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (caf0930) 93.17% compared to head (9b832b4) 93.22%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #933      +/-   ##
==========================================
+ Coverage   93.17%   93.22%   +0.05%     
==========================================
  Files          10       10              
  Lines        3690     3747      +57     
==========================================
+ Hits         3438     3493      +55     
- Misses        252      254       +2     

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