Prevents potential undefined behavior based on how the call is made. Of
course, eventually these fields should actually be set.

fix travis macos build

trying to fix travis macos build fail. don't know if this work or not. I don't have mac to test it :)

Small formatting and documentation fixes

Merge fuse and scheme, add mkfs utility, remove old utility

Travis: fix config (on Linux)

With this change, travis will work on Linux at least.

Let root manipulate a fuse-mounted redoxfs vfs.

This (along with a few Makefile changes) solves my issues building on macOS.

New kernel