Updated README. Still missing new plotting functionality
Cleaned up experiment loop
Progress point updates. Latency counters currently disabled while we work out issues with state carried over between experiments.

--HG--
rename : include/causal/counter.h => include/causal/progress_point.h
Log samples much less frequently
Moved runtime-only includes out of top-level include directory

--HG--
rename : include/causal/inspect.h => lib/include/causal/inspect.h
rename : include/causal/perf.h => lib/include/causal/perf.h
rename : include/causal/profiler.h => lib/include/causal/profiler.h
rename : include/causal/progress_point.h => lib/include/causal/progress_point.h
rename : include/causal/real.h => lib/include/causal/real.h
rename : include/causal/thread_state.h => lib/include/causal/thread_state.h
rename : include/causal/util.h => lib/include/causal/util.h
Reorganized python driver
Preliminary plotting implementation. Seems to fail without X server