Refine log messages when verifying probabilities.

[JohnHalleyGotway]

Describe the Task

This issue consists of 2 tasks:

Task 1:
As described in met-help (https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=96813), clarify the log messages when no climatology bins have been defined.
Existing log message:

DEBUG 4: parse_conf_climo_cdf() -> For "cdf_bins" (1) and "center_bins" (false), defined climatology CDF thresholds: >=0.00000,>=1.00000

New log message:

DEBUG 4: parse_conf_climo_cdf() -> Since "cdf_bins" = 1, no climatology bins will be applied.

Task 2:
The "prob" config file entry can either be specified as a dictionary (when parsing NOAA GRIB files) or as a boolean (for other probability data). Both types are supported and fine. However, when specified as a boolean, met-9.1 prints the following warning message:

WARNING: Dictionary::lookup_dictionary() -> dictionary lookup failed for name "prob"

Modify the code to suppress this warning message since it only causes confusion.

Time Estimate

1 hour.

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None

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[JohnHalleyGotway]

Tested by running one of the Grid-Stat commands executed by running "make test".
With met-9.1:

cd met/scripts
export TEST_OUT_DIR=../out 
../bin/grid_stat ../data/sample_fcst/2005080312/pop5km_2005080312F096.grib_G212    ../out/pcp_combine/sample_obs_2005080800V_12A.nc    config/GridStatConfig_POP_12    -outdir ../out/grid_stat -v 4

The log messages include:

WARNING: 
WARNING: Dictionary::lookup_dictionary() -> dictionary lookup failed for name "prob"
WARNING: 
DEBUG 4: parse_conf_climo_cdf() -> For "cdf_bins" (1) and "center_bins" (false), defined climatology CDF thresholds: >=0.00000,>=1.00000

After compiling this change and rerunning, the log messages are now:

DEBUG 4: parse_conf_climo_cdf() -> Since "cdf_bins" = 1, no climatology CDF bins will be applied.