make autocompletion work again

* turn on for each query field with autocomplete = 1
* set non-default dictionary with autocompleteDictionary = dictName
* udpate JavaScript to automatically apply jQuery IU autocomplete to all affected input text fields
Do not lose extended search setting when submitting the form

* was caused by previous use of fieldNamePrefix
	* now construct slightly weird field names à la »q[{fieldInfo.id}]« for the same effect (hard to guess that this leads to the query parameter tx_ext_plugin[q][fieldInfoID]
cleanup solr_frontend.js
germania-sacra: load bistum KML files into map