Added output of sort result.
Improved DBoD2 comment: Added mapping hint and source_id.
Merging of documents supports now the case that merge field's values are not unique.
Parameter qt is now supported in solr adapter.
For id queries sort, row etc. are not set any more.
morelike this id queries (qt=morelikethis) and responses are supported now.
qt=dismax is supported (the configured solr adapter is replaced with Solr1Adapter).