Added Participation.next method to pair with .previous method.
Added attendance_cutoff_time to signify how long a player can be in a raid before they count as having attended.
Added StandingCalculation.time_in_raid method, to determine how much time the character was online and in the raid.
Added StandingCalculation.qualified_for_attendance? method, to easily determine if character was in raid long enough to be counted as attending.
Added delinquent_loss calculations based on tardiness percentage.
Added numerous additional Standing Calculation tests.