Allow register records (ISO19135) to be converted to SKOS and used as thesauri in thesaurus keyword picker

[simonp]

ISO19135 register standard allows thesauri/codelists/controlled vocabs to be managed in GeoNetwork as metadata records (using iso19135 plugin schema already available).

Should be possible to add a thesaurus in SKOS format from an iso19135 catalog record to GeoNetwork by specifying uuid - do this by:

• adding a new type of thesaurus called 'register' which when activated creates a SKOS record from iso19135 and inserts into GeoNetwork ThesaurusManager
• ThesaurusManager checks and updates SKOS if iso19135 metadata record changes
• encode iso19135 to SKOS XSLT
• do not allow user to update register type of thesaurus in GeoNetwork thesaurus panel - this should be done by modifying the base iso19135 record instead using the GeoNetwork editor etc - ThesaurusManager will detect that iso19135 record has changed and will recreate SKOS for GeoNetwork thesaurus

Two sample iso19135 records (one for ANZLIC theme keywords and the other for NASA GCMD science/theme keywords) have been created to test this function and are available in the iso19135 plugin schema

[simonp]

Added in svn rev 8921