nucleus.base does not indicate if it should be absolute or not

[Fishrock123]

I assume this should be an absolute path, but it is not specified and no example is given yet.

[creationix]

Correct, I've not specified it fully yet. Currently it's just implementation specific and informational (intentionally undefined), but we can probably standardize it as an absolute path to the base if it's always a real path.

I do have grand plans of eventually implementing nucleus in the browser on top of a paravirtual FS and TCP stack. But I suppose that even in that paravirtual filesystem, there can still be absolute paths.

We can keep it undefined for now till someone has a need to depend on it, or we can define what we thing will be useful and support it forever.