Wed Jun 6 16:04:32 EDT 2012

Pull commands for dumps

Added _ad and _fd scheme functions that can be called from target to
perform memory dumps without pushing.  It's not sure how these will be
useful, but at least it's possible to gather more data than in a
single packet, since host is smarter about chunking.

Another option would be to push a data generator that can be called by
host code to continuously stream data.