add syntax for specials
checkpoint, got some cross-file stuff to load over on cpo

- Make eval-lib much clearer on what is stack safe and what isn't
- Add syntactic form for "special" imports, only handle a few for now
- Tweak module loading via requirejs to first un-load modules of the
  same name, and tweak repl module naming to accomodate this
error, not resume, with the failure case
resolve cached modules in load loop
Merge branch 'master' into special-imports
better names and errors for gdrive imports
thanks, javascript
change naming convention to / to work better with ui tools
Merge branch 'master' into special-imports
bootstrapped with special-imports