Treedb

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Update endangerment sources.

Add PyPI ``project_urls`` to setup.py.

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Represent countries as dicts instead of tuples in ``treedb.iterlanguoids()``.

Update endangerment sources.

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Update for new altname providers and endangerment sources in Glottolog ``v4.1``.

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Use ``expanduser()``in ``treedb.create_engine()`` and ``treedb.set_root()``.

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Allow to specify glottolog repository location via ``TREEDB_REPO`` environment
variable (alternative to ``treedb.set_root()``).

Use current working as default Glottolog repository location if ``treedb`` is
imported as plain installed package instead of a git checkout.

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Initial release.