packing the step layout structure.

we must use a small block instead of a shared midplane block.

If the user's network specification includes "sn_single" or a specific
adapter name, this adds support for multiple protocols and an
instance count. Support is still lacking for "sn_all" and limited
testing has been done.

If multiple network instances are required, then use the instance=#
option rather than parenthesis after the protocol name. This is far
simpler especially if someone specifies different prococols with
difference instance counts or specifies an instance count in both
places (after protocol name plus using instance=#).

Conflicts:
	doc/html/selectplugins.shtml

logic.

still messages we find when we poll but haven't given it back to the real
time yet.