Document how to search and query with the HST

we do not have proper wiki docs about searching and querying. I'd like to document:

1) How HstQuery works, and some important parts like setLimit
2) How HstFilter works, and some tips (like how to full text search, how to not mix ORs and ANDs in one filter, and how to boost hits in title)
3) Explain BeanUtils incomingBeansQuery
4) Explain BeanUtils faceted nav combined with free text search