proposal:
* rename target `lint` -> `gjslint`
* add a `lint` target that would depend on `hint` and `gjslint`.

=> `make lint` would still lint everything

One caveat: if "hint" fails, "gjslint" would (sometimes) not be run; "make -k" seems to circumvent that, but we may write it ourselves like this:
```make
lint:
  $(MAKE) -k gjslint hint
```