Re-work the way that headers from the wrapped perl cvsweb are detected. The old way had a subtle bug that stripped blank lines from the output.
Re-work the way that headers from the wrapped perl cvsweb are
detected. The old way had a subtle bug that stripped blank lines
from the output.

nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome