Also, rename "Addressed devices" to "Indirect memory access".
I do this because I need to add indirect versions of !, @ and ,
to allow boostrapping directly to EEPROM and that A,, thing I've
added to assemblers felt like really bad names.
With this change, I'd like to generalize the use of the * suffix
for aliases.
This would be useful, for example, to allow the assembler to write
straight to an AT28 EEPROM without going to RAM. This would be a
life saver in machines with tight RAM such as the SMS.
When writing the xcomp documentation, I realized that with careful
threading and by accepting a bit of code duplication in the xcomp
toolset, I could de-stabilize a couple of words.
(n) and EXIT are a bit trickier, but I think it can be done. It
would be nice to get rid of stable wordrefs...
