[plt-scheme] default file for planet shorthand "require"s, other than "main.ss"

For the shorthand form of "planet" "require", which currently permits 
the file name to default to "main.ss", would it be possible to make that 
default to a file specified in "info.ss" (e.g., the existing 
"primary-file" field)?

I think it's the usual case that we want a default file, but it's also 
the usual case (at least when editing multiple PLaneT packages in Emacs 
simultaneously), that we want to name the default files something other 
than "main.ss".

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