the somewhat hacky fail-if-they-want-over-100mbps method, but could in the
future draw the info from the database or something if it ends up being
necessary.

Setup Failure(255): Output as follows:

*** /usr/testbed/devel/newbold/lib/ns2ir/parse.tcl:
    Bandwidth requested (150000) exceeds maximum of 100000 kbps!
*** /usr/testbed/devel/newbold/lib/ns2ir/parse.tcl:
    [run] link0 has only a single node. LANs must have at least 2 nodes in them.
*** /usr/testbed/devel/newbold/bin/batchexp:
    NS Parse failed!