implement multi-predicate input type
Merge branch 'multi-pred'
Conflicts:
	data/html/resource.html
enable connection reuse with keep-alive
open in new tab
don't hide input on selectMust types
remove repeatable indicator
allow navigate & selecte searchresult by arrow keys and enter
add language and script (empty) mappings, relying only on the common mapping
add script to index rdf resources (tested with script+language) WIP