Added triangular distributions.
Moved the diseaseDuration output variable from main loop to unit_state_monitor.
Removed the param_block_t struct in zone_model.c since it only contained a single member. Small change to the automatic level numbering in zone.c. It would be better to ignore the level numbering and just sort by increasing radius.
Fixed the SQL queries in 2 modules so that they won't return rows that have NULLs in the fields of interest.
Moved the setting of _iteration.first_detection from detection_monitor to event_manager so that detection_monitor does not have to be instantiated when tabular output is not requested.
Fixed the text to expect that indicates exit on first detection.
Provided default delay for contact spread model when no delay element is present in the XML.