Changes at around 1e-3 level probably due to different handling of
refinement regions and resulting patches.

* master: (25 commits)
  Update some python code to remove errors
  Add *.data to gitignore
  Add basic CI script
  fix euler_3d_radial/qinit.f90 to agree with v4.x version
  create gauge filenames that allow more than 5 digits also in 1d
  check that abs(gaugeno) < 2**31 in data.py
  create gauge filenames that allow more than 5 digits also in 3d
  create gauge filenames that allow more than 5 digits in gauge number
  update examples/README.txt regarding env variables
  modify examples/README.txt with new instructions
  move run_examples.py to clawutil
  rename run_tests.py -> run_examples.py
  clean up run_tests.py
  fix typo in .gitignore
  cleaned up amrclaw files with SHARED do warnings
  new features: checkpt style 4 and added STOP feature
  bug fix for cases when only x is periodic
  Remove extra paren typo
  Drop Python 2 support, remove imports of six and __future__
  Add meson.build.
  ...

The gauges disagree slightly at later times with old data.
Running older versions of the code such as v5.8.0 give the same results
as this new data, so not sure when it diverged.

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