[S06] make MAIN short switches a bit saner
[S06] make MAIN short switches a bit saner

The variable name of a parameter is purely an implementation detail
of the subroutine, and shouldn't be a concern while parsing command line
arguments. Instead rely on already existing alias syntax for named parameters.

git-svn-id: 53605643c415f7495558be95614cf14171f1db78@31976 c213334d-75ef-0310-aa23-eaa082d1ae64

prammer/specs,tokuhirom/specs,prammer/specs,perl6/specs,perl6/specs,prammer/specs,tokuhirom/specs,tokuhirom/specs