This supports width, precision, length, and padding.

lwIP can't run (or be initialized) until the kernel creates the
scheduler thread, so create a worker thread that inits lwIP.

Kernel threads might not have a cwd or parent.  An alternative
to changing exit might be to fill in some dummy values.

Conflicts:
	kernel.h

Runs the "benchmark" suite

Waking up a process after the its wait time expires might livelock
core 0, but it's unlikely.

Use threadalloc to create gc_worker threads (and eventually use it
for lwIP threads.)

make crange compile

Not important yet; in fact, none of the benchmarks run long enough to do gc