grextras: save serialize work in progress
grextras: serious work on the serialize_port block
gras: and more serious work on deserialize_port
gras: using PMC polymorphic archive work + unit tests
Merge branch 'next' into serial_work2
serialize: various fixes and additions to unit test
serialize: deserialize does not need input loop
serialize: removed serialize_common, this belongs in gras
serialize: created grc xml wrappers
serialize: lots of misc fixes for serial blocks