Now both side and diffraction are active from 2013-1-20

refs #8009

Note have updated all the existing IDF to the
best of my ability to use is="monitor" rather
than mark-as="monitor"

As the new geometry doesn't yet have the other side banks in,
there is no real difference between the old and new geometry.
Except that the energies are correct in the new!

Valid for runs 16694 onwards.

Had to add the non-existent pixels into the IDF as the NeXus file
doesn't differentiate between pixels that are there or not.

Lower-case first letter of instruments and scripts directories. All our installers did this anyway and this will mean less manipulation of the properties file is needed. Re #2753.