Make record editable

It adds the new action setEditable to the list of actions in Administration page. The user can select one or more records and set them editable even if they come from another repository; this allows to handle editability of single records while the catalog.enableEditForAllPubMethods parameter of gpt.xml applies to all records.  The function changes the publication method of each selected record, setting it to "editor" as if it was created with the geoportal's editor. A useful enhancement would be to separate the pubmethod from the editable property by adding another flag in the database and use this for editable property of a record.