add CSW search

[pvgenuchten]

gxp has a csw module, it could be adepted to meet the requirements
alternative would be to create a separate component

the csw query box should be visible by default, so not in a panel
the csw search field has an autosuggest which triggers the geonetwork main.suggest method
the search results should be styled, so it's easy for users to decide whether it's usefull to add the layer to the map (small thumbnails, organisation and more could be added)

Default output schema, handled by geoext is DC, however there is no probably no thumbnail reference in there, in the full output schema there is a link available

[stvno]

How do you mean not in a panel? My initial idea is to put the search field in the 'westPanel' above the layerTrees