Flatbackground now works for non-distribution data and SANS Display Mask is now clearer re #2612 fixes #2599

Introduced a number places where if the workspace or instrument of the workspace is
not set properly that warnings are displayed.

Removed now obsolete constant wavelength option in IC code. 

Re-enable the IC test and further improve it. 

Note workspace of fitting function will normally automatically
be set. But for now one exception is when using 

  IFitFunction *out = FunctionFactory::Instance().createInitialized(alg2.getPropertyValue("Function"));
  IPeakFunction *pk = dynamic_cast<IPeakFunction *>(out);  

To set the workspace for pk add a line like:

  pk->setMatrixWorkspace(ws2D, 0,-1,-1);

re #2446

refs #2564 - some changes to indirect scripts etc before I start butchering them too badly in effort to move to reducer.

re #2607. ParaView macro scrips. Useful scripts for performing common operational blocks against ParaView. Note that as part of our install process we can push these files into the PV application directories.

Fixes #2714. Fix crash in MantidPlot when deleting a workspace while a script is running. Managed to removed the need to set whether the GIL is acquired as I found the magic Python function that tells me whether there is a current thread state or not and more importantly doesn't crash if there wasn't!

            Eliminated L2 parameters from addPeaks
            Eliminated the L2 TableColumn
            Added const where applicable
            Implemented indexing peaks with an orientation matrix