sspm v1.0.0 Zenodo + JOSS release

• JOSS release
• documentation and testing suite improved
• added summary functions and fixed issues in plotting variables

sspm v0.9.1 [First CRAN release]

v.0.9.1

Merge branch 'main' of github.com:pedersen-fisheries-lab/sspm

sspm v0.8.0

fix temp var

sspm v0.7.5.1

change version

sspm v0.7.4

Merge pull request #39 from pedersen-fisheries-lab/fitting-tests

Fitting tests

sspm v0.7.2

update version

sspm v0.7.1

update version

sspm v0.7.0

minor update

sspm v0.1.0

First release, base package working, ready for first user testing.