add progress into the iso values

Client requested to support the search on a to-be-added field (filter), to be called "progress" to enable keyword-value search as progress:planned or progress:completed. (progress:planned is how one would find Marketplace data)  The typical XML structure in a record looks like:  <gmd:status>  <gmd:MD_ProgressCode codeList="http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#MD_ProgressCode" codeListValue="completed">planned</gmd:MD_ProgressCode></gmd:status>