The package breaks currently breaks with the following message:
```
fixed-output derivation produced path '/nix/store/5dh1mdj027ad8sprk12fqa5h5bpdxs5n-sasview' with sha256 hash '12k1w4yq1mzjxcp2cqb562c7cbwzhi54rsbmgi0fax0i1660q167' instead of the expected hash '05la54wwzzlkhmj8vkr0bvzagyib6z6mgwqbddzjs5y1wd48vpcx'
```
To fix the build the following changes were applied:
* Switched to latest master for now as the older releases have a broken
`py.test` configuration and altering hashes.
* Added `checkPhase` which invokes `py.test` directly and drops
duplicated files from `dist/tmpbuild`.
* Rebased the patches `pyparsing-fix.patch` and `local_config.patch` for
the latest master revision.
Additionally refer to the discussion in #40381 for further reference.
Sasview is a data fitting and analysis package for small angle
scattering data. More information can be found at
https://www.sasview.org.
There is some unfortunate cruft to this commit. SasView uses the
xhtml2pdf python package, which has a specific version of html5lib as
a dependency. This module manually loads that version into sasview.
I haven't made xhtml2pdf available as its own package due to these
circumstances.
