Update default precision for summary()

[WardBrian]

Submission Checklist

• Run unit tests
• Declare copyright holder and open-source license: see below

Summary

Closes #550 by cleaning up the summary method and changing it's default sig-fig value to 6

Copyright and Licensing

Please list the copyright holder for the work you are submitting (this will be you or your assignee, such as a university or company):
Simons Foundation

By submitting this pull request, the copyright holder is agreeing to license the submitted work under the following licenses:

• Code: BSD 3-clause (https://opensource.org/licenses/BSD-3-Clause)

[codecov-commenter]

Codecov Report

Merging #551 (902ec71) into develop (ee3692e) will increase coverage by 0.13%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop     #551      +/-   ##
===========================================
+ Coverage    79.56%   79.70%   +0.13%     
===========================================
  Files           45       45              
  Lines         9705     9735      +30     
===========================================
+ Hits          7722     7759      +37     
+ Misses        1983     1976       -7     

Impacted Files	Coverage Δ
a/cmdstanpy/cmdstanpy/cmdstanpy/model.py	88.95% <0.00%> (-0.41%)	⬇️
cmdstanpy/cmdstanpy/stanfit/vb.py	94.66% <0.00%> (+0.38%)	⬆️
a/cmdstanpy/cmdstanpy/cmdstanpy/stanfit/vb.py	94.66% <0.00%> (+0.38%)	⬆️
...r/work/cmdstanpy/cmdstanpy/cmdstanpy/stanfit/vb.py	94.66% <0.00%> (+0.38%)	⬆️
cmdstanpy/cmdstanpy/stanfit/mcmc.py	92.84% <0.00%> (+0.46%)	⬆️
a/cmdstanpy/cmdstanpy/cmdstanpy/stanfit/mcmc.py	92.84% <0.00%> (+0.46%)	⬆️
...work/cmdstanpy/cmdstanpy/cmdstanpy/stanfit/mcmc.py	92.84% <0.00%> (+0.46%)	⬆️
cmdstanpy/cmdstanpy/stanfit/mle.py	91.50% <0.00%> (+1.21%)	⬆️
a/cmdstanpy/cmdstanpy/cmdstanpy/stanfit/mle.py	91.50% <0.00%> (+1.21%)	⬆️
.../work/cmdstanpy/cmdstanpy/cmdstanpy/stanfit/mle.py	91.50% <0.00%> (+1.21%)	⬆️

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[mitzimorris]

thanks for cleaning up this mess!