- Update to 4.14.0:
  * enhancements:
    - filtering and grouping area for binned (1D) spectral data has been improved
    with changes to the default behavior and many bug fixes resulting in changes
    to the statistics, degrees-of-freedom and energy flux in comparison to the
    previous version for the same data with the same filter.
    - updates to allow users to change the hard limits of XSPEC model parameters
    - the sample_flux routine now returns correct information for the clip column
  * documentation changes:
    - improved PHA simulation documentation
    - improved Filtering and grouping of PHA data documentation
    - added sherpa.image module documentation
    - added section on running tests to developer docs
  * Infrastructure Changes:
    - updates to support Apple ARM
    - update to support Xspec version 12.12
    - update fftw from version 3.3.8 to 3.3.9
    - clean up of compiler and sphinx warnings
    - changes to support gcc 9.3.0 in conda defaults
    - updates to support python 3.9 including readline 8.1 upgrade, numpy minimum
    1.19 (numpy 1.18 minimum for python 3.7/8)
    - test infrastructure clean up and updates
  * bug fixes:
    - updates to fix several 'unable to parse region string: None' errors
    - fix issue where save_all() of a loaded image with no region filter would fail
    on reload
    - fixed issue with plot_model() being called before notice or ignore could
    lead to filters not getting applied
    - fix to error out instead of crash when grouping data using an unsupported
    method

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