Text filter fixes

General questionBits:
 clustering by tags
 getUniqComponents(Products[])
 subdivideComponents(from: Products[], sub: Products[])

2 new question types

Multiword intersecting filtering in UI

FLAG for using subsubcategory instead of tags

D.join now pass index to called fn

Autoupdate export data on tag add\remove.
Format quiz title.
Add product search result hint.
DOM. add backref element insert ability