dicate a bad state transition
	act_regular	a regular character
	act_nop		no-op used for intermediate states
	act_cr		carriage return
	act_lf		line feed
	...
</pre>
<p>
'st_base' is enhanced further and is joined by other states  in
InterpANSI.

<h2>
Why use Actors?
</h2>
Actors seem like an odd and heavy-weight way to implement actions.
The following techniques were considered:

<ol>
<li> Numbers used for actions and a switch statement for the semantics
   of the actions. An "inheritance" scheme can be impl