Fix test criteria to fix paqa_latency.c

[philburk]

It was failing because the latency was too low.

Now we allow lower latency.

Fixes #742

[RossBencina]

I regard any decreasing behavior, even due to rounding error, as a bug, therefore I suggest:

Suggested change

	finalLatency > (previousLatency - 0.001));
	finalLatency >= previousLatency);

[philburk]

After discussion with Ross, the plan is to:

1. Start checking at 0.0
2. expect the finalLatency to be >= suggested, UNTIL it clamps and then it should not increase.

[philburk]

expect the finalLatency to be >= suggested, UNTIL it clamps and then it should not increase.

I added that test. But we are seeing failures where the latency hits the maximum and then keeps going up!

Using device #4: 'Maono PD200W Mic USB' (Core Audio)
------------------------ paqaCheckMultipleSuggested - INPUT
 lowLatency  = 0.00441667
 highLatency = 0.01375
 numChannels = 1
 sampleRate  = 48000
   suggestedLatency[ 0] = 0.000000, finalLatency = 0.003396
   suggestedLatency[ 1] = 0.001375, finalLatency = 0.003396
   suggestedLatency[ 2] = 0.002750, finalLatency = 0.003396
   suggestedLatency[ 3] = 0.004125, finalLatency = 0.004125
   suggestedLatency[ 4] = 0.005500, finalLatency = 0.005500
   suggestedLatency[ 5] = 0.006875, finalLatency = 0.006875
     maximumLatency = 0.006875
   suggestedLatency[ 6] = 0.008250, finalLatency = 0.008250
/Users/phil/Work/portaudio/pagit/qa/paqa_latency.c:310 - ERROR - Latency should be == maximumLatency
INPUT CHECK FAILED !!! #4: 'Maono PD200W Mic USB'

also

Using device #7: 'ZoomAudioDevice' (Core Audio)
------------------------ paqaCheckMultipleSuggested - OUTPUT
 lowLatency  = 0.0333333
 highLatency = 0.0426667
 numChannels = 2
 sampleRate  = 48000
   suggestedLatency[ 0] = 0.000000, finalLatency = 0.032313
   suggestedLatency[ 1] = 0.004267, finalLatency = 0.032313
   suggestedLatency[ 2] = 0.008533, finalLatency = 0.032313
   suggestedLatency[ 3] = 0.012800, finalLatency = 0.032313
   suggestedLatency[ 4] = 0.017067, finalLatency = 0.032313
   suggestedLatency[ 5] = 0.021333, finalLatency = 0.032313
   suggestedLatency[ 6] = 0.025600, finalLatency = 0.032313
   suggestedLatency[ 7] = 0.029867, finalLatency = 0.032313
   suggestedLatency[ 8] = 0.034133, finalLatency = 0.034125
     maximumLatency = 0.034125
   suggestedLatency[ 9] = 0.038400, finalLatency = 0.038396
/Users/phil/Work/portaudio/pagit/qa/paqa_latency.c:310 - ERROR - Latency should be == maximumLatency
OUTPUT CHECK FAILED !!! #7: 'ZoomAudioDevice'