Added basic name_table type.
Added weak-ass module chasing and a lame test which at least passes.
Made import chasing be so much more sane.
Made module loading use the module_loader cs->loader.
Made the main function call check_module.
Got rid of Windows-specific chdir, used abstract in-memory module loading for test_check_file.
Implemented deftype-checking -- no recursive holding, valid names and params.
Cleaned up excessive lookups of deftype entries.