Improve see from / see also handling in MARC editor authority menu

Improve see from / see also handling in MARC editor authority menu

The 2.0-style authorities use a browse menu that currently consists
of matches against the 1XX entries, which makes working with see from /
see also entries rather difficult. To prepare for an authority browse
method that does surface matches against 4xx and 5xx entries, we will
now display the 4xx and 5xx entries for a given authority record
immediately below the 1xx entry in the browse menu, with the entry
text italicized, aligned to the right, and prefixed with "See also" or
"See from" appropriately. This won't provide a perfect alphabetized
solution - we won't know which field provided the alphabetical browse
match, so the best we can do is present the 1xx in the main browse
menu and the 4xx / 5xx below - but it will provide access to the other
references.

We now display the 4xx fields in the authority summary / selector menu
along with the 5xx fields. As part of making the 4xx and 5xx fields
first-class entries in the context menu, 5xx subfields are no longer
appended to their 1xx field menu entry with a "/" in the context menu.

$0 subfields are no longer added to the 4xx and 5xx fields from the
authority summary / selector menu; if a user had selected a 5xx and the
$0 that had been added by the menu, the field would have incorrectly been
linked to the 1xx authority record. To link to a 5xx entry, for now the
workaround is for the user to select the 5xx subfield(s), "Apply Selected",
then right-click on the new subfield to generate a new authority context menu.
To improve the 5xx handling, we need to make the "See also" entry fire a new
authority context menu based on the 5xx contents so that the actual 1xx
authority record can be inserted and linked against.

Consider an authority record containing the following fields:

150 $a Infants
450 $a Babies
550 $a Children

The ASCII-ized authority context menu will now display:

Infants              ->
    See from: Babies ->
  See also: Children ->

The submenu in each case will currently lead to the authority record
for "Infants". If we teach the underlying authority browse and startswith
methods to return matches based on 4xx and 5xx fields instead of just 1xx
fields, then the menu triggered by a right-click on "Childs" might look
like:

Chickens             ->
Infants              ->
    See from: Babies ->
  See also: Children ->
Choking              ->

The main entry will be out of alphabetical order, which is not ideal,
but the linkage from the 5xx should at least be evident. (Also, this
suggests that when clicking on a 5xx entry in the authority menu is
changed to launch a new authority menu, it should use the 1xx-only
browse variant to avoid showing the record from which the user was
referred...)

git-svn-id: svn://svn.open-ils.org/ILS/trunk@19091 dcc99617-32d9-48b4-a31d-7c20da2025e4