Added test for generation of reversing of sequences holding basic types
Added ValueType interface to be used by the Tuple class and the Record interface
Added two utility methods: one for checking if a type is the char type and another for building a Java string from characters
Minor cleanup in class visitor
Fix for generation of sequence enumerations (e.g. ['a', 'b']) that forgot to treat the special case where the sequence is a sequence of chars and the corresponding type is mapped to the 'String' type