Xtof: documentaton and import adjustement for PoldiProjectRun

creation of the documentation for this file
	modified:   Code/Mantid/Framework/PythonInterface/plugins/algorithms/PoldiProjectRun.py
The wiki documentation has been created, and is aimed to be the main one. The other Poldi algorithms will refer to this one.
The wikiSummary has been added.
The import declaration has been cleared.
Some useless functions has been removed.

Refs #100