Sets some reasonable limits, which are higher when logged in since that
infers a little extra trust.
Helps prevent against large resource consuption attacks via super heavy
search queries.
Thanks to Gabriel Rodrigues AKA TEXUGO for reporting.
This changes indexing so that a.b now indexes as "a", "b" AND "a.b"
instead of just the first two, for periods and hypens, so terms
containing those characters can be searched within.
Adds hypens as a delimiter - #2095
