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: overrun on target runtime
                    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 (cave return or CCR bailout or OC fTTS plan)


Calculation Phases
------------------------------------------------------------------------------------------------------

PHASE_00_DONE					0x00	// calculation cycle finished
PHASE_10_DIVE_INIT				0x10	// once-per-dive    initialization of the deco engine
PHASE_20_CYCLIC_INIT			0x20	// once-every-cycle initialization of the deco engine
PHASE_30_EXTENDED_BOTTOM_TIME	0x30	// calculate extended bottom time
PHASE_40_BOTTOM_GAS_NEED		0x40	// calculate gas needs for bottom segment
PHASE_50_NDL_TIME				0x50	// calculate NDL time
PHASE_70_ASCENT					0x70	// calculate ascent
PHASE_80_RESULTS				0x80	// results - initialization
PHASE_81_RESULTS_STOPS_TABLE	0x81	// results - publish stops table
PHASE_82_RESULTS_NDL			0x82	// results - publish data / within NDL
PHASE_83_RESULTS_DECO			0x83	// results - publish data / in deco
PHASE_84_GAS_NEEDS_PRESSURES	0x84	// results - convert gas needs from volumes to pressures
PHASE_85_GAS_NEEDS_CAVE			0x85	// results - tag gas needs as calculated in cave or open water mode
PHASE_90_FINISH					0x90	// finish calculation cycle