Maintenance release

• Add Python 3.9 conda package support
• Switch Action CI from daily to weekly
• Patch gallery doc for matplotlib update

Maintenance release, no functional changes.

• Update CI, Installation docs, and Contributing docs for revised strict channel priority semantics in mamba release 0.15.0
• Add bug report template for Issues

Maintenance release, no functional changes

Continuous integration and deployment

• Update CI with mamba/boa and CI for breaking changes in dependencies
• Deprecate PyPI package uploads

Docs with thanks to @sappelhoff and @AJQuinn

• Update user installation instructions in sphinx docs for mamba, conda, no pip
• Add Contributing section to sphinx docs for developers
• Added intersphinx links, numerous corrections, fixes, references, to the docs

• Code updates for pymer4 0.7.1 (conda package) and lme4::lmer 0.22 warnings
• Switch CI from TravisCI to Actions
• Undo stale python 3.6 pinned conda package dependencies
• Add conda packages for python 3.7, 3.8

bug fix for #173
fitgrid default time and epoch_id values changed to time and epoch_id align with mkpy and spudtr

Pinned pandas below 0.1.0 b.c. rpy2 breaks, so no LMER

Known bugs: #173

Patched pytests to report discrepancies between fitgrd.lmer() results for different versions of r-lme4 and r-matrix and fail on potentially serious deviations.

version bump

bump release for Zenodo

Maintanence release to sync PyPI and Anaconda Cloud package distribution vN.N.N