Performance Measurement
-----------------------

When compiled in, the dive mode screen shows 5 performance data values:

AAAA.BBB.CC.DD.EE

AAAA: Relative runtime of the last deco engine invocation, in ms,
      signed value: positive numbers: longer than target
                    negative numbers: unused time budget

BBB:  longest runtime found, in ms

CC:   Calculation phase in which the longest runtime occurred, see table below

DD:   Number of deco engine invocations required to complete the last normal plan

EE:   as above, but for alternative plan


Calculation Phases
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PHASE_00_DONE					00	calculation cycle finished
PHASE_10_DIVE_INIT				10	once-per-dive    initialization of the deco engine
PHASE_11_CYCLIC_INIT			11	once-every-cycle initialization of the deco engine
PHASE_20_EXTENDED_BOTTOM_TIME	20	calculate extended bottom time
PHASE_30_NDL_TIME				30	calculate NDL time
PHASE_40_CAVE_ASCENT			40	calculate cave mode return/ascent
PHASE_50_INITIAL_ASCENT			50	calculate initial ascent
PHASE_60_DECO_STOPS				60	calculate deco stops
PHASE_70_RESULTS				70	results - initialization
PHASE_71_RESULTS_STOPS_TABLE	71	results - publish stops table
PHASE_72_RESULTS_NDL			72	results - publish data / within NDL
PHASE_73_RESULTS_DECO			73	results - publish data / in deco
PHASE_80_GAS_NEEDS_SWITCHES		80	calculate gas needs - find gas switches in NDL bailout mode
PHASE_81_GAS_NEEDS_ASCENT		81	calculate gas needs - needs of bottom segment and ascent
PHASE_82_GAS_NEEDS_PRESSURES	82	calculate gas needs - conversion from volumes to pressures
PHASE_90_FINISH					90	finish calculation cycle