ADVIEWER (8.40) Replace all occurences of MPeg with MJPeg.

MJPegView.Id really should be corrected from "uk.ac.gda.epics.adviewer.mpegview"
to "uk.ac.gda.epics.adviewer.mjpegview" since Mpeg and Mjpeg are different
and we may want to implement mpeg streams in the future.
Merge branch 'gda-8.40' of ssh://dascgitolite@dasc-git.diamond.ac.uk/gda/gda-epics.git into gda-8.40
Change warn to debug when requesting less than full size of waveform
CollectionStrategy for pixium triggering
Support different case versions of DataType enum strings.
Make declaration of DataType enum public
Merge branch 'gda-8.40' of ssh://dascgitolite@dasc-git.diamond.ac.uk/gda/gda-epics.git into gda-8.40
Change JRE compliance to 1.7 to allow switch on string value
Merge branch 'gda-8.40' of ssh://dascgitolite@dasc-git.diamond.ac.uk/gda/gda-epics.git into gda-8.40
MXGDA-1944 Zebra: add support for reading the 4 TTL out signals
Merge remote branch 'origin/gda-8.40'