Sdss-tree

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- Includes updates and changes to sdss5 paths and envvars

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- Added missing MANGA_SPECTRA_TEMPLATES to dr15 config.

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- Updating tree config for dr17 VACs
- Added new Sphinx doc page for computing changes in the tree
- Adds ``release_date`` to tree configs for DR and MPLs. Unreleased configs have ``release_date`` set to None.
- Adds new ``release_date`` property to ``Tree`` which returns the release date as a ``datetime.date`` object.
- Expanding ``Tree.list_available_configs`` to sort by "DR", "MPL" and "IPL".
- Deprecating ``Tree.list_configs`` in favor of ``Tree.list_available_configs``

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- Added method ``get_release_from_config`` to convert a given tree ``config_name`` into its release name.
- Added a new ``release`` attribute, accessible on a ``Tree`` instance.
- Fixing the mangarss path template with proper "wave" keyword arg, similar to mangacube
- Adding new tree config for MaNGA release MPL-11

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- Added dr17 release config
- Added tree_version to bin, expected by some old/existing IDL product tags
- Updated the path syntax for special functions to "[function_name]|" to resolve issues with inclusion next to other characters
- Added new sdss5 paths for apogee
- Changed sdss5 paths for apogee from sdss4 to handle ``healpix`` grouping and simplified kwargs with special functions
- Updating the code to write out old sdss_paths.ini file.
- Added ``preserve_envvars`` options to ``replant_tree`` to preserve users original environment variables

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- Added MaNGA MPL-10 release config
- Added new paths for DR16+; VACs for APOGEE_JOKER