[db] adds demo script
[db] the graph updater inside host_profiler is in its own thread.
[db] removed extra print statements
[db] host_profiler populates window time with extents from monitors
[db] adds script to make sure profiler is publishing on time
[db] fixed issue with using cached node uri's that was causing problems
with restarting nodes. Fixes #13
[db] adds graphprofile_adapter for diarc mva
[db] changed some error types in host_profiler and callback_timer
[db] adds non rqt demo program to test graphprofiler_adapter