Phase enhancement changes / ModeA phase improvements

1. ModeA phase detemined from ratio of signal portion of bits (ie subtract noise)
2. fix error in detectOutOfPhase function - although we no longer use this
3. Change applyPhaseCorrection
   a. Change amplification ration to 23/16 (1.4375)
      Ratio changed from tests of several GB of collected data shows a peak
      in the effectiveness of the amplification that has occurs in the vicinity
      of 1.40 - 1.46 (sqrt(2)?) 23/16 is an easy integer ratio.
   b. Only reduce values (bit 0 or bit 1) same logic as before
      More data recovered - suspect that previous method was more likely
      to cause an overflow condition.
   c. Rather than using "detectOutOfPhase" only try PhaseEnhance if we
      don't have too many decoder errors
      - corrections variously likely regardles of return from detectOutOfPhase()
      - if more than MODES_MSG_ENCODER_ERRS decoder errors most unlikely to
        recover additional messages - vastly reduce number of PE tries.
Minor change to ModeS preable detect

- avoid checking bits 3 and 10 which may be contaminated by phase error