Clean up inherited qtiplot python imports

[mantid-builder]

Original Reporter: Russell Taylor

I propose to remove the qtiplotrc.py startup script (and qtiUtils.py as well). This was prompted by the fact that I was having trouble running 2 scripts (i.e. this and mantidplotrc.py) when launching IPython, but looking into the file I think very little of it is actually needed. Anything that is can go into mantidplotrc.py.

Also, I want to thin out qti.sip by removing the parts that aren't applicable to MantidPlot. This is primarily the exposure of QtiPlot's fitting classes.

[mantid-builder]

This issue was originally trac ticket 4335