Increase log interest

[fredclausen]

Add AR_STATS_VERBOSE/--stats_verbose, which will enable extra logging of interesting stats. At the moment, the only such statistic that is shown will be a breakdown of all received frequencies as a percentage of the total for that decoder type.

Example

ACARS in the last 1 minute(s):
Total messages processed: 2444
Total messages processed since last update: 3
ACARS 130.025: 1638/2444 (67.02%)
ACARS 131.725: 113/2444 (4.62%)
ACARS 131.55: 434/2444 (17.76%)
ACARS 130.425: 3/2444 (0.12%)
ACARS 129.525: 171/2444 (7.00%)
ACARS 129.9: 21/2444 (0.86%)
ACARS 129.35: 20/2444 (0.82%)
ACARS 129: 21/2444 (0.86%)
ACARS 130.825: 2/2444 (0.08%)
ACARS 129.125: 15/2444 (0.61%)
ACARS 131.525: 2/2444 (0.08%)
ACARS 131.85: 1/2444 (0.04%)
ACARS 131.25: 1/2444 (0.04%)
ACARS 130.85: 1/2444 (0.04%)
ACARS 130.45: 1/2444 (0.04%)

VDLM in the last 1 minute(s):
Total messages processed: 4524
Total messages processed since last update: 5
VDLM 136975000: 3842/4524 (84.92%)
VDLM 136800000: 422/4524 (9.33%)
VDLM 136650000: 242/4524 (5.35%)
VDLM 136945000: 14/4524 (0.31%)
VDLM 136825000: 4/4524 (0.09%)