Updates to the search interface and the catalogue

The last months a number of updates to the search interface and the backends serving these have been added. This weekend the catalogue was updated to take benefit of some of these efforts. Harvesting of information from relevant repositories is yet not fully implemented in the newe solution, but e.g. harvesting of information from WMO GTS (real time exchange of meteorological information) is now partly implemented.

Work in progress for the time being covers: