merged changes on corpus4 and head
minor changes to logging
changes to handling of ampersand when parsing resourcefragments
merged changes ocrpus4 (only logging) with head
merged versions (corpus4, head); handling of ampersand in query
reworked cql-widget (simple input by default, expand complex on demand)
reorganized query_input - simplified thanks to new qi.CQLwidget
small changes to layout  - positioning, link on logo