Allow preselection of collections/fonds in search2

Created by: GVogeler

Search results in search2 can be drilled down to fonds and collections by the GET paramater context (e.g. http://www.monasterium.net/mom/search2?q=koloriert&option=and&img=&annotations=&sort=date&categories=cei%3AwitnessOrig%2Ccei%3AphysicalDesc%2Ccei%3Aabstract&context=AT-StiASP%3BUrkunden%2CIlluminierteUrkunden). search2 could contain a html-select-box listing all archival fonds and collections. The select-box could be preselected by a GET-parameter context for mom/search2 to allow links between starting pages of fonds and collections to dedicated search as it is currently the case for archives and fonds (e.g. http://dev.monasterium.net/mom/AT-StiAStP/BlUKBebenhausen/fond)