translated Integer validation message

added validation support #11

ensure lables are unique in the schema

began work on the syntax component to aggregate data

This copies over a lot of configuration functionality from the data
plugin, but is still missing the functionality itself.

first go at data searching

fixed getMenuText method signature

Add an adminpage for schema<->page/ns assignments

Todo: The test if a page is in a namespace with an schema assigned is
not yet implemented.

added some more beef to the admin view

Now all existing schemas are listed in the TOC and a form allows adding
new ones.

initial wizard generated structure