[ic] form profiles

[Grant]

Braintree gives this error when attempting to process a credit card sometimes:

"Postal code can only contain letters, numbers, spaces, and hyphens."

I've only used required/mandatory with mv_form_profile so I'm not sure
how to set up this sort of a check to work with [error].  Can someone
point me in the right direction?  I seem to remember "zip" in
etc/profiles.order that I was planning to use as a starting point but
it isn't there any more.

- Grant