We actually have users that need _exactly_ this functionality! We have been
faking it for a while by doing other things (like reading into a separate
system and then copying entries in vectors over manually to the new enlarged
system) but it will be great to have this functionality directly!
T
There's a new feature that just went in the svn head, something that
we greatly wanted for PECOS but that might be useful to others as
well: physics upgrading restarts. If you construct a System with
variables "A1", "A2", "B1", "B2", and then you read in a data file
with variables "A1" and "B1" a
