Issue i009 - Multiple actions. Proposal

I had an action to make a proposal for closing issue i009 - Multiple
actions. The general feeling in the room at the face-to-face seemed to
be that sticking with one action (possibly per actor/role depending on
how we close issue i007) was fine, but we needed to call this out in the
spec and point out that layered specifications need to take this into
account. Here is the proposal:

Add the following sentence to the description of the [action] property
in section 3 of the core spec.

	Protocol and application designers building on this
specification are encouraged to take care when designing their protocols
or 	applications that they do not violate the requirement that there
be exactly one [action] property.

Flames, comments, suggestions to the usual address.

Gudge