Revert "Makefile change: only remove libevent on dist-clean rather than just clean"

This reverts commit fb57f6b2e5e52614a39b54cafbbc7e4e931232b1.
Fix regressed HSBencher submod
Update cilk_tests to allow more failures
update submod: Fix build of arbLatCalls
Add pingPong benchmark, update submod
oops, fix typo in prev
Name one of the new microbench benches by which variant it is
Update submod
Split out the microbench variants into separate benchmarks.  Update submods
Allow runbenchmark script to run without rootdir argument
Try again with NOT cleaning libevent from make clean
Print the time for detectivework
Merge branch 'concurrent_cilk' of github.com:iu-parfunc/concurrent_cilk into concurrent_cilk
Adding env vars to turn off ivars and use ivar busywait variant.
* CCILK_IVARS_OFF: turns off ivars (and takes out all code paths that we
  added for them)
* CCILK_IVARS_BUSYWAIT: turns on the ivar busywait variant.
Make it an error not to pass rootdir
Minor hack
Merge branch 'concurrent_cilk' of github.com:iu-parfunc/concurrent_cilk into concurrent_cilk
Minor: print args passed to benchmark script
Fix simple script bug
update submod