Fix issue 1242

[vyzo]

Adds an -r|--run option to gxi so that it can force import and run main for a module, regardless of whether it is a library or interpreted module.

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[vyzo]

Progress:

$ gerbil build
$ gerbil env gxi -r test/main.ss 
*** ERROR -- 
*** ERROR IN ? [Error]: Implement me!

But it is not purely interpreted, so this fails:

$ rm -rf .gerbil
$ gerbil env gxi -r test/main.ss 
*** ERROR IN gx#core-expand-import%__% -- 
*** ERROR IN ?
--- Syntax Error at (expand vyzo/test/main): cannot find library module
... form:   :vyzo/test/lib