- Add a unified runner script for DIS
- Remove explicit case study termination script
  (do `kill ${cat pids.txt}` instead)
- Auto-create bin directories for TACLe
- Add the python cache directory to the gitignore
- Tweak input path representation in benchmark name files

Adds <period> and <criticality level> parameters to benchmarks and
disables cache flushing when compiled with LITMUS. Also fixes build
with LITMUS enabled on yamaha.cs.unc.edu.

Also allows output to be disabled, automatically infers _rt_lock_id,
and allows for a specific pair ID for paired tasks. (The pair ID is
added to all the semaphore and shared memory names, allowing multiple
pairs to run in the system at a time.)

- anagram: Fix two off-by-ones, the heap size, and the result
- rijndael_dec: Reset result checksum at job start
- huff_enc: Reset mutable global variables at job start

This allows `run_bench.sh` to replace all previous general paired
benchmarking scripts. See `run_everything.sh` for an example of how
to use the new script.

This also fixes two critical bugs present in the old scripts:
1. The cpus_list was incorrectly set for resctrl when running
   synchronous pair timing with L2+L3 isolation (i). Each write
   to that file replaces the previous contents, and it was previously
   written once for each core. This prevented the entire 1st core
   from using any L3 cache.
2. The competing task list was indexed improperly in the asynchronous
   pair timing script. This caused the competing task to always be
   identical to the task being profiled.
These issues combine to imply that in the rejected RTSS'20 paper:
- All Level-C SMT timing data is suspect
- Level-A and -B SMT timing data with L2+L3 isolation (i) is
  wildly optimistic

Also move run_all_dis.sh up a directory in preperation for
further changes.

- anagram, audiobeam: Reset heap in _init() function
- g723_enc: Don't use static local variables
- huff_dec: Reset all global state in _init() function

No other changes.

- Use consistent approach to prevent computations from being
  optimized out in the DIS benchmarks
- Don't print results in the DIS benchmarks
- Fix a memory corruption in TACLe's "epic" benchmark reflect1()
- Fix return codes for all benchmarks
- Rename run_baseline.sh to run_bench.sh in preperation for this
  being the main benchmarking script

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.