Added Shirley menu item
Shirley background function. NOT WORKING YET!
Merge branch 'master' of https://github.com/dleifohcs/srs-igor

Conflicts:
	User Procedures/SRS/func/SRS-SPECS-manip.ipf
	User Procedures/SRS/func/SRS-SPECS-menu.ipf
Argh reconciliation of some merge problems