lang: Fix off-by-one error stack setting

lang: Support multiple traverses

lang: Moved visited stack to module_find

lang: Switch to depth first search for modules

lang: Add module loading dependency walker

lang: Print all done when main is finished

lang: Add code to find a module by its name

lang: Add a second module as a test

lang: Add module IDs as X macros

lang: Parse a module ID to the compiler

lang: Automatically find modules

lang: Error on compile pass failure

lang: Read module name and module uses

lang: Add multiply and divide and rational loop test

lang: Use mpq functions for rational math

lang: Allow creating rationals from an mpq value

lang: Free the VM stack trace

lang: Change rational_value to rational_integer

lang: CAnonicalize rationals

lang: Rename number to rational

lang: Add debug logging

lang: Add stack traces on abort

lang: Fix typo

lang: Move abort_msg and abort_if to vm

lang: Fix up error function comments

lang: Pass VmState to abort

lang: Couple object functions to VmState ...

This is needed for coupling abort() to VmState and stack traces.

lang: Check for malloc failure

lang: Switch to mini-gmp rationals for number representation

lang: vm: Check stack malloc failure