add rawRdf property; add structureResult

structureResult transforms a result array to an
associated array and after that in an array
containing only instances of the according class,
for instance a list of DataSets
add generateSparql... functions and structureResult

Each class got its own structureResult function, which
transforms a given list of array's into a list of
instances of the instances class, from which this function
was called.

There are a couple of generateSparql-whatever functions
now, which serve the purpose to generate SPARQL queries
for a certain scenario. But, this query has to be executed
by a system like Enable or Erfurt, which are able to access
a triple store.