msearchd: add a strict Content-Security-Policy reminded by bentley@, thanks!

msearchd: show excerpt of search results Since it works by mean of snippet() I don't have any clear idea of where sqlite added the <strong> tag and where/if that tag was part of the email' text; here's why clt_putmatch is a bit paranoic.

msearchd: load the templates like gotmarc(1)

don't query empty strings it's a "SQL logic error" apparently (not surprising.)

add notice when there aren't search results

enable and fix warnings

msearchd: add link back to the listing

import msearchd: the fastcgi search server