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Second alpha release.
* Major additions to API
* New modules:
- threads
- configuration
- structures
- mapping
- ctypes_util
* New functions and classes:
- CloseableMixin in recipes
- to_hex, camel2snake, snake2camel, timestamp in string_util
- set_labels in mpl_utils
- real_divide, threshold, ang_diff_* in math
* API changes:
- Moved half of recipes to mapping
- Updated Namespace, (in mapping), added setdefaults