decorate all function parameters with ARGIN etc.

[kjs]

All functions (or pretty much all of them) in PIRC should have their parameter declarations decorated with the 'seatbelts' macros, such as ARGIN, NOTNULL, etc.

[cotto]

I'm adding the newbie tag to this ticket since this is mostly a matter of looking at a function to figure out how an argument is used, marking it with the appropriate macros and running headerizer. It's also a good way to gain a basic familiarity with Parrot by rooting around in its internals.

The only tricky bit is that it's not obvious how this ticket can be closed. I guess we'd need a test for that.