Use $*PROGRAM instead of $*PROGRAM_NAME

Bring roast up to speed with S28

The following files still need to be updated, but it's out of my level
of expertise:

S02-names/pseudo.t
S02-magicals/progname.t
Merge pull request #44 from perl6/hoelzro/special-var-program

Use $*PROGRAM instead of $*PROGRAM_NAME