Improves asString for modules.

All modules have the same “class”: module,
but different values.  Maybe?
Adds auxiliary file to tests.

printc.gct needs to be pushed to the web server if
tests are to run clean in the browser.
Moves t152_inheritsReturnObject back to tests.

This test now passes!
Also adds missing .out file for t15c
Makes identifiers defined in type decls public.

They were not public, and more importantly, they
were not written to the .gct.
Merge branch 'master' of https://github.com/apblack/minigrace
Removes types from ast.grace.

This is an experiment to eveluate the impact of type-checks
on compilation speed.
Adds stub io.grace

This file defines the types and has dummy bodies for the methods.
It creates a suitable .gct for the io module.