Uses a single generator to allow easy construction of an ND point from
pseudo-random numbers thereby presenting a cleaner interface inline with
the other ND generators.

The Vates quantification requires using the Sobol sequence for producing
a point in ND space. The interface as it was made it difficult to
swap out other random number generators. There is now a generic ND
interface that returns a vector of numbers.

The ArrayDataSource wraps a simple array of doubles stored
in row major order, so the array can be viewed using the
ImageViewer. This is a convenience class that should make
it easy to apply the ImageViewer in other ways.
Also, modified ImageViewDemo to use the new ArrayDataSource,
as a demonstration of the new class.
refs #5058

This stops Qt libraries such as WebKit being included unnecessarily
in the install kit, which significantly increased its size.
Actually including more than we currently use (which is only Qt, QtCore,
QtGui & uic) because the others relate to Qt packages on which MantidPlot
itself already depends so we wouldn't gain much by leaving them out.

Unfortunately this is yet another modification to the NSIS template, but theres not other way to get this done with the current CMAKE version 2.8.1

Reusabel code segments moved to static methods that are more amenable for
reuse

MantidUI will now just create an ImageViewer for a
MatrixWorkspace, for both event workspaces and for
Workspace2D.  This works since generateHistogram()
is now available for both types of MatrixWorkspace.
refs #5058

refs #5058

Since VectorHelper::rebin() requires current X vector with
one more entry than the current Y vector, even if the
Workspace2D is a distribution, we need to adjust the current
X vector before calling rebin.  This is a convenience method
that essentially reverses the convertToBinCentre() method, so
it seems to belong in VectorHelper.
refs #5285

Started to modify the RefLReduction to take into account the new tags and format of the config file. This refs #4303 #5071