Remove limit parameter from rdf_admin_autocomplete_property (and all similar pick list functions for properties and classes)

The properties for dcterms are:

abstract, accessRights, accrualMethod, accrualPeriodicity, accrualPolicy, alternative, audience, available, bibliographicCitation, conformsTo, contributor, coverage, created, creator, date, dateAccepted, dateCopyrighted, dateSubmitted, description, educationLevel, extent, format, hasFormat, hasPart, hasVersion, identifier, instructionalMethod, isFormatOf, isPartOf, isReferencedBy, isReplacedBy, isRequiredBy, issued, isVersionOf, language, license, mediator, medium, modified, provenance, publisher, references, relation, replaces, requires, rights, rightsHolder, source, spatial, subject, tableOfContents, temporal, title, type, valid

The limit parameter silently truncates the list at date (the default, 15th term).

The expected behavior, in all cases, is to show all terms, to enable the user to choose correctly (and especially not to skew the choice to terms that come earlier in the alphabet).

If the autocomplete UI element can't show all choices, then it's probably the wrong UI element.