Raise an InsufficientArgumentsError rather than a plain ValueError so
that cmdline.main calls print_usage() after catching it. Showing this
output is consistent with what other commands do and saves callers
from needing to follow up with reproman -h.
Raise an InsufficientArgumentsError rather than a plain ValueError so that cmdline.main calls print_usage() after catching it. Showing this output is consistent with what other commands do and saves callers from needing to follow up with
reproman -h
.Closes #466.