Add a function to extract the parameter list.

[Drup]

I was going to add iter and fold, and realize it was just better to export the list.
The internal representation is not exposed, so you still have the liberty to change it.

I also improved a bit the documentation and removed a layer of exception handler.

NB: The xen backend doesn't work for me at the moment, so It's basically untested. No travis on this repository. :(

[Drup]

Woops, I managed to miss #4 ...

[mor1]

Re Xen-- what's not working? Have you tried http://github.com/mirage/mirage-vagrant-vms? (What platform do you develop on?)

[Drup]

Just patiently waiting for mirage/mirage-platform#138 ;)

[MagnusS]

Thanks! It's a bit different as it exposes the parameters directly while #4 adds argv so they can be parsed with Cmdliner. Perhaps useful to have both? @nojb

[Drup]

I think it would be nice to have both, yes, but anyway, as @nojb was saying, it should be integrated in mirage-plateform.

[MagnusS]

Yes, agree - merging while we figure out how to handle argv.