Add Grid-Stat configuration options for distance_map dictionary

[JohnHalleyGotway]

Describe the Enhancement

The issue dtcenter/MET#1673 and corresponding pull request dtcenter/MET#1857 add new columns to the distance map (DMAP) line type created by the Grid-Stat tool.

This includes one change to the Grid-Stat configuration file in the "distance_map" dictionary:

distance_map = {
   baddeley_p        = 2;
   baddeley_max_dist = NA;
   fom_alpha         = 0.1;
   zhu_weight        = 0.5;
   beta_value(n)     = n * n / 2.0;
}

The beta_value(n) function is a new configuration option. The wrapped Grid-Stat config file in METplus should be updated to handle it.

Please see existing documentation for more details about the configuration options, science, and equations.

Time Estimate

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Issues should represent approximately 1 to 3 days of work.

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Relevant Deadlines

Prior to the METplus 4.1.0 release.

Funding Source

2702691

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