Add future warning for Python 3.7 deprecation

Add support for XMILE's non-negative

Add support for XMILE's non-negative flag for stocks and flows, includying also the behavior section.
Add support for XMILE's MIN and MAX with one argument.

Add time dependency in random functions

Merge pull request #398 from SDXorg/dev-3.9.0

v3.9.0

Bump actions/setup-python from 3 to 4 (#383)

Bumps [actions/setup-python](https://github.com/actions/setup-python) from 3 to 4.
- [Release notes](https://github.com/actions/setup-python/releases)
- [Commits](actions/setup-python@v3...v4)

---
updated-dependencies:
- dependency-name: actions/setup-python
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

avoids changing the state of the argument

Merge pull request #365 from SDXorg/pysd37

pysd 3.7.0

Set parsimonious version to avoid crash

Correct bugs when classifying variables per module

Correct typos