+ update some phpdoc
+ provide support for softDelete methods on elements for custom behaviour when events deleted
+ [OE-2679] allow setting of no known allergy on a patient
+ rename hasAllergy to hasDrugAllergy
+ tweaks to allergy functions
+ display alerts for allergies in patient summary box, and at top of patient summary page.
Merge branch 'master' into develop
[OE-3496] Allergies (incomplete)
Merge branch 'feature/front-end-rewrite' of github.com:openeyes/OpenEyes into feature/front-end-rewrite
Merge branch 'develop' into feature/front-end-rewrite
Merged changes from develop into theme. Refs 5baebaa3d7215c94830e603d8e594d9704ded646