What's Changed
Major
* Addition of pypestutils integration supporting easier use of [pypestutils](https://github.com/pypest/pypestutils) functions for pilot point setup and interpolation. Including the definition of geostat hyperparameters for non-stationary fields.
* Feat ppu3 by jtwhite79 in https://github.com/pypest/pyemu/pull/546
* Implementation of functions for Gaussian Process Regression emulation
* Development of PyPestWorker class and helper functions for rapid model deployment using pure-python (leveraged by GPR methods)
* python pest++ worker by jtwhite79 in https://github.com/pypest/pyemu/pull/556
* Mods to DSI method to utilise PyPestWorker
* Feat dsi_pyworker by rhugman in https://github.com/pypest/pyemu/pull/559
Additionally
* Option added to `os_utils.run()` to use subprocess library - Feat run_sp by p-ortega in https://github.com/pypest/pyemu/pull/539
* Feat normtransf optional extrapolation by rhugman in https://github.com/pypest/pyemu/pull/528
* fix to get_pestpp by jtwhite79 in https://github.com/pypest/pyemu/pull/538
* Hotfix ppshortnames by jtwhite79 in https://github.com/pypest/pyemu/pull/542
* Fix for change with quotechar and delim flex in built in csvwriter by briochh in https://github.com/pypest/pyemu/pull/547
* Update .gitattributes for GitHub language recognizition as Python by martinvonk in https://github.com/pypest/pyemu/pull/550
* (hotfix) update .gitattributes by mnfienen in https://github.com/pypest/pyemu/pull/551
* allow parsing function to add_py_function by martinvonk in https://github.com/pypest/pyemu/pull/549
* Appended some small changes to account for 1d array shapes from unstructured grids by jonathanqv in https://github.com/pypest/pyemu/pull/560
* removing rc_params setting in plotutils by briochh in https://github.com/pypest/pyemu/pull/561
New Contributors
* p-ortega made their first contribution in https://github.com/pypest/pyemu/pull/539
* martinvonk made their first contribution in https://github.com/pypest/pyemu/pull/550
**Full Changelog**: https://github.com/pypest/pyemu/compare/1.3.7...1.3.8