Journal session was corrupted with channel id's not valid for journals.
May have been caused by incorrect QHash coding in MinutesAtPressure.cpp
Revised Min and Max functions not to look at MT_JOURNAL sessions.
Updated release notes,.
TimeAtPressure Graph now has the same look and feel as the Pressure Graph.
Configuration chamges to the Pressure Graph now also impact the TimeAtPressureGraph.
Changes are identified in MinauteatPressure.cpp (first 100 lines)
