wrapper for libzfs_core C library (documentation)

 libzfs_core is intended to be a stable interface for programmatic
 administration of ZFS. This wrapper provides one-to-one wrappers for
 libzfs_core API functions, but the signatures and types are more natural to
 Python.
 .
 nvlists are wrapped as dictionaries or lists depending on their usage.
 Some parameters have default values depending on typical use for
 increased convenience. Enumerations and bit flags become strings and lists
 of strings in Python. Errors are reported as exceptions rather than integer
 errno-style error codes. The wrapper takes care to provide one-to-many
 mapping of the error codes to the exceptions by interpreting a context
 in which the error code is produced.
 .
 This package contains the documentation.