Updated `module/xplm': new functions

New functions to more closely interact with the various virtualenv
frameworks.

There was an issue where the installer would PASS even when it had
actually FAILed; fixed.

Added some docs on package requirements for `module/py'.
Unit test `xplm' added: nima/site#34
Updated `module/ldap': retrospective updates

Much has changed since this module was last tested, and this commit
get this module re-aligned with what is current.
Updated `module/ng': retrospective updates

Much has changed since this module was last tested, and this commit
get this module re-aligned with what is current.
Updated `module/mongo'