message ids for warnings and errors

[John W. Eaton]

I've started to implement the

  warning (msgid, fmt, ...)
  error (msgid, fmt, ...)

feature.  This will allow us to also do things like

  warning off MATLAB:divideByZero

and (probably) eliminate all the warn_* built-in variables.  I would
rather not tag our warning and error messsages internally with
"MATLAB:", and I'm not a big fan of StudlyCaps so perhaps we would
have message IDs like "Octave:divide_by_zero" instead, with a lookup
table so that this is equivalent to MATLAB:divideByZero (unless we can
rely on a uniform translation like Octave -> MATLAB and _[a-z] ->
[A-Z]).  Does anyone know of a comprehensive list of IDs that Matlab
uses for warnings?

Thanks,

jwe