re-work search handling

* configure all query fields in the queryFields TypoScript array
	* the fields for simple search are indicated by simple = 1
* all query parameters now stored in the 'q' parameter array
* all query fields are now evaluated for queries
* form fields are now filled with their value in query results
* use GET instead of POST (which lost the query parameters in the URL when using facets)
Improve Facet display
cleanup
only use »q« parameter if it actually exists
add ability to add multiple CSS/JS files to <head>
avoid problem when there are no active facets
German localisation
Germania Sacra display improvements