Misc improvements

* Migrate to new indexing structure
* Index / Fix template name for default title and lang
* Add gml:* date support
* Add gml:* simple text support
* Remove duplicates from label
* Properly display label for GROUP or CHOICE element
* Add subtemplate for format spec
* Improve configuration for long filed using a textarea
* Add suggestions for resource id and geokeywords
* Fix label repetition when having multiple field