Feature, implement :main command

[Neil Mitchell]

Hi,

Attached is a patch that adds a :main command to hugs. :main arguments
is equivalent to arguments `withArgs` main, but easier to use because
you don't need to import anything extra, and the arguments are parsed
as if they were arguments - i.e. :main my test "of this", instead of
["my","test","of this"] `withArgs` main.

Since i don't know a whole lot about this area of the compiler, and it
is changing the user interface for everyone, I thought it best that
someone checks its at least sane before i do anything with it.

Thanks

Neil
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