py-joblib: Update to 0.12.1
Notable changes:
- Implement the 'loky' backend.
- Prevent numpy arrays with the same shape and data from hashing to
the same memmap, to prevent jobs with preallocated arrays from
writing over each other.
- Reduce overhead of automatic memmap by removing the need to hash the
array.
- Introduce the concept of 'store' and refactor the Memory internal
storage implementation to make it accept extra store backends for
caching results. backend and backend_options are the new options
added to Memory to specify and configure a store backend.
- Allow parallel_backend to be used globally instead of only as a
context manager. Support lazy registration of external parallel
backends.
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