supporting stub deletion annotation in faux properties
Merge branch 'maint-rel-1.6' of https://github.com/vivo-project/Vitro into maint-rel-1.6
VIVO-483 Obsolete VIVO URIs in Vitro search code.

Break out the mechanism for building a list of Additional URI Finder instances. Override that in VIVO. Move AdditionalURIsForContextNodes to VIVO. References to obsolete URIs are in comments.
Merge branch 'maint-rel-1.6' into develop