gnorb-utils.el: Common utility file.

Still trying to make partial loading work okay. Not sure there's really
a point, though.
gnorb-bbdb.el: New function gnorb-bbdb-mail-search

Search for mails from the visible record(s). Currently only works for
the notmuch search backend.
gnorb-utils: (gnorb-prompt-for-bbdb-record)

New function
gnorb-org.el: (gnorb-org-contact-link)

New function
gnorb-bbdb.el: (gnorb-bbdb-mail-search)

Better implementation of gnorb-bbdb-mail-search, supported search
backends include notmuch, namazu, and mairix.