Adding new performance counters for counting the number of invocations and getting the overall time executing various AGAS cache functions.
Fixing compilation issues
fixed number of OS threads reported stencil
Merge branch 'agas_cache_perf_counters' of https://github.com/STEllAR-GROUP/hpx into agas_cache_perf_counters
Merge pull request #1219 from STEllAR-GROUP/agas_cache_perf_counters

Adding new AGAS cache performance counters