Adding members for data pipe information to arguments.
Adding AutoFilterDescriptor methods to query argument disposition by type.
Adding AutoFilterDescriptor methods to make IO without using the argument type enum.
Creating Broadcast and Pipe declaration methods in AutoPacketFactory.

PROBLEM: These changes assume that type is equivalent to AutoFilter instance, and will not play well with NewAutoFilter.
Revised data pipe tests to use AutoPacketFactory methods.
Removing untenable RAII AutoFilterPipe classes.