Closes #44. Attributes included in the search: The attributes are add…

Created by: strec

…ed to the full text index of the metadata.charter.public collection. The search is extended to descendants of cei:text to include the attributes, too. The attribute categories are added to the search categories. The logic in charter.widget.xml is altered so that no errors happen when search hits are only in attributes and the charter view is entered from search results page.