Added check for necessary "level" attribute in <om:add><om:query>.
Solr adapter uses now post instead of get, because vufind's extended search may create huge requests.
Implemented first version of DisMaxQueryBuilder.
Fixed handling of facets.
FieldMapping is now thread safe and needs no reset when mappings were applied.
FiedMerger script type only reduces multi values to single values when non facet or highlight documents are processed.
The FusionRequest is now available in the ScriptEnv when a ScriptType is applied.
Implemented subquery support.
Implemented {!...} support.
Ping servlets logs calls and request params.