Bug 35903: In cataloguing authority plugin using autocomplete must set operator exact

Bug 35903: In cataloguing authority plugin using autocomplete must set operator exact

When cataloguing and using authority plugin, there is auto-completion on inputs and default operator is "contains".
When using auto-completion and selecting a result it would be logical to set operator "exact".

See doc https://api.jqueryui.com/autocomplete/#event-select

This patch also adds auto-completion missing on "Search all headings".

Test plan:
1) Create a new authority Topical Term with heading "Cart"
2) Create a new authority Topical Term with heading "Carthage"
3) Create a new biblio record
4) Use authority plugin on field 650
5) You see current operator are "contains"
6) Enter "Car" in "Search main heading ($a only):"
7) You see auto-completion showing "Cart" and "Carthage"
8) Click on "Cart"
9) You see operator changes to "is exactly"
10) Submit form to see the results
11) Clear form and repeat 6-9 for the three other inputs

Signed-off-by: Michelle Spinney <mspinney@clamsnet.org>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>