Implemented functions.

Functions func_directoryEmpty and func_directoryGetFiles implemented and
partly documented.
__eq__ and _ne__ added.

Overloaded the equal and not equal operators as a simple comparison of
the ips is not
sufficent. See the comment for more datail.
Additional functions implemented.

Added two functions for creating and removing a directory.
Fixed a bug in func_directoryGetFiles(), the output of ls lacked
the indicator for a directory.
Implemented Mountpoint and Device.

Implemented raw versions of all functions of Mountpoint and Device
including documentation. The interface has changed slightly.