ENH: store model name in tree.params, fixes #354

[YapengLang]

No description provided.

[coveralls]

Pull Request Test Coverage Report for Build 19688091231

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
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• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 6 of 6 (100.0%) changed or added relevant lines in 3 files are covered.
• No unchanged relevant lines lost coverage.
• Overall first build on piqtree-phylim-pipline at 99.241%

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Totals
Change from base Build 19688077480:	99.2%
Covered Lines:	1961
Relevant Lines:	1976

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💛 - Coveralls