Query: Fixed copy constructor of element types.

Was creating null components array.
Query: Fixed minimim and maximum values for float and double.

Was using MIN_VALUE where it should have been using +- infinity.
Removing old `common` project, which is no longer used.

It used to be used for communication between the storage manager
and the front end, which was written in GWT. But that front end
was removed long ago.
Made storage manager depend on rsaquery.