[Bashdb-remake] Shell substitution errors

[R. B. <ro...@pa...>]

Of late I've been getting "shell substitution errors" when running
"remake -x". Alas at the time I was getting these, I couldn't
investigate. 

I've just change the '--trace=noshell' option to be like
--trace=command but without the shell "set -x" tracing added. The
short option for this is '-y'.

Having just complained about automake incompatibility, I confess that
this is incompatible behavior with the previous --trace=noshell
meaning. However as I use remake more, I realize more of that is
useful and what isn't and I doubt if anyone ever used --trace=noshell
in its former incarnation while at least one person (me) will use it
in its current form.