Adding program flow image to stencil documentation.
Adding new performance counters for counting the number of invocations and getting the overall time executing various AGAS cache functions.
corrected num_os_threads in printout for distributed stencil examples
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
stencil examples added number of localities to printout
stencil print out missing comma
Removing superflous returns. adding move assignment for completeness
Fixing stupid typo
Fixing stupid typo
Fixing problem in and_gate that occured after latest promise changes
Reintroduce hybrid spinlockpool for thread_data
Fixing receive_buffer
Fix registering locked mutexes to ignore while suspension
Removing MiniGhost example. Moved to new repository: https://github.com/STEllAR-GROUP/miniapps
mini ghost removal part 2
Improving the ignore_lock business
Extending dataflow to pass through non-future arguments