Sdss-tree

-------------------

Fixed
^^^^^
- standardized case output for ``get_available_releases`` method. Added ``public`` only option.

-------------------

Added
^^^^^
- new method ``list_available_configs`` that lists the available config files to load with Tree
- new method ``get_available_releases`` that builds a list of data releases from the config files

Fixed
^^^^^
- Issue :issue:`11` - silence and no input when multiple module paths found

-------------------

Added
^^^^^
- new path definitions for MaNGA VAC Visual Morphology
- new path definition for MaNGA VAC Galaxy Zoo
- new path definitions for MaNGA VAC Firefly
- new path definitions for MaNGA VAC GEMA
- new documentation for adding new paths into sdss_paths.ini
- config file for DR16

Fixed
^^^^^
- Issue :issue:`10` - bug fix in setup_tree.py

-------------------

Refactored
^^^^^^^^^^
- Modified data/cfg structure to handle versioning of envvar and path definitions
- data cfg files now inherit from one another
- deprecated sdss_paths.ini file and moved into new PATHS section in individual cfg files

Added
^^^^^
- new temporary path for manga images for releases MPL-8 and up
- new method show_forest to display the environment for configs not currently loaded
- new method list_configs to show all available configs for loading
- new tests for setting up the tree; creating and copying module/bash files and env symlinks
- added the option for env symlink creation into the setup_tree.py bin file
- added option to specify default config to write into .version file

Changed
^^^^^^^
- replaced non-existent %designdir special function with %definitiondir
- changed yaml loaded to use yaml.FullLoader in compliance with pyyaml 5.1
- switching disutils.StrictVersion to more standard parse_version

Fixed
^^^^^
- Broken syntax on apogee in paths.ini file
- Broken syntax in some platelist definitions
- Broken etc/Makefile after implementation of new setup_tree.py
- Bugfix on setup_tree.py when empty tree directory first entry in MODULEPATH

-------------------

Changed
^^^^^^^
* Refactored bin/setup_tree to install module files

-------------------

Changed
^^^^^^^
* Wrapped config file opens in with to ensure proper file closure

Fixed
^^^^^
* Bug when config=None is explicitly passed into Tree