There was previously a huge amount of shared code that had to be
copied back and forth. This should reduce the maintenance burden
by containing all future changes to a single file.

New unified library is fully backwards-compatible but also
introduces and the easy-to-use `for_each_job` macro which
replaces the specific `for(...) START_LOOP ... STOP_LOOP`
format requirement and is generally much harder to abuse.

New unified library also automatically cleans up its shared memory
and semaphores, so this commit also removes the separate
`cleanupSemaphores` binary.

I also found a precursor of `extra.h` written by Sims in
`litmusStuff.h`. This code is only interesting for historical
purposes, so it is also removed in this commit.

This commit also adds debug options to all the Makefiles and
silences rm's complaints about non-existent files in make clean.

New macro `for_each_job` simplifies instrumentation.
Backwards-compatible.

- No parameter or output format changes
- Better error messages
- Auto-detect core
- Fix off-by-one error in job counting
- Explicitly invoke the scheduler with sched_yield() between jobs
  so that there's less work to do when (if) the scheduling timer
  interrupt comes around. (This has a surprisingly significant
  impact on timings.)

- Use malloc rather than static allocations
- Check that timings array is long enough before inserting each sample
- Include clearer error handling

- Revert type change in Neighborhood microbenchmark
- Remove inputs modified to fix in the available memory on the
  i.MX6DQ PRP test platform
- Change default configuration to build without LITMUS/MC^2/MMDC

- Remove unused parameters to extra.h
- Use floats to avoid integer overflow when timing long loops
- Only include litmus headers and/or MMDC headers if the appropriate
  define is set in extra.h
- Update job parameters to match those used in my PRP experiments