Introduce abstract parallelism value that is composed of cores and a further
parameter.
Add ACDC build script that can be used to build several flavors of scalloc.

See script header for usage.
Add possiblity to disable linearizable emptiness check.
Reformat.
Use futex based lock instead of pthreads on Linux.
Remove non-lin empty check.
Add padding to fast lock.
Swap Cpu indicator for Parallelism where needed.