the plab_ez slice create page.  Also fix plab_ez so that submission to
the advanced interface without first browsing to the basic form
generates fewer errors.

nodes.

Should probably be done with the defs file and makefile.

if we work futher on it, we have a good starting point. Make the
existing templates validate with the DTD.

and a template. The idea is that it's a general tool for generating
NS files for standard topologies (ie. LANs), filling in some
user-supplied values. Has some features that are useful for NS files,
like default values and skipping or commenting out sections if values
for variables are not given.

Could probably use some better error checking on the the XML file.

Does not yet get installed.