Thanks to Evan_ for the report and patch.

* Indent versionchanged at method level, not class level
* Mark up ``--help`` to avoid generating an en dash
* Use forward slash in Unix command line with a dollar sign ($) prompt

ctypes.CDLL instances.

ctypes.CDLL instances.

KeyError could be raised when cached function with full cache was
simultaneously called from differen threads with the same uncached arguments.

KeyError could be raised when cached function with full cache was
simultaneously called from differen threads with the same uncached arguments.