authorities indexing - MAJOR changes

authorities indexing - MAJOR changes

For DOM indexing, added index_matching_heading option
to create indexes for matching an entire authority
heading -- the index works by indexing a heading
such

150 $aCars$xElectric$zEngland$vScience fiction

as something like

"cars generalsubdiv electric geographicsubdiv england
formsubdiv science fiction"

Also started adjust names of some indexes to conform
to languaged used in the MARC21 and UNIMARC standards, e.g.,

"See" => "See-from"
"See-also" => "See-also-from"
"Conference-name-heading" => "Meeting-name-heading"

Signed-off-by: Chris Cormack <crc@liblime.com>
Signed-off-by: Joshua Ferraro <jmf@liblime.com>