added method for new record which also properly initializes the columns
Merge branch 'IlwisCore/master'
removed the _record (attributerecord) as this has been delegated to the feature for reasons of performance
added index based getters for the attribute values of the feature.
added init record method which properly initialized column values
added clone method as an attribute record is now stored in a unique_ptr and thus can not be shared
back to shared pointer for the attribute record; can cause a crash otherwise. not completely understood and  probably needs to investigated in the future. Sharedpointer is ok though but I like to use unique pointer were possible/reasonable.