Add support for setting hss_ec_value in MET config files.

[JohnHalleyGotway]

Describe the Enhancement

dtcenter/MET#1749 added a new HSS_EC statistic to the MCTS line type. This is configurable by setting the hss_ec_value configuration option for Point-Stat, Grid-Stat, Stat-Analysis, and Series-Analysis. This was added to MET in 10.1.0-beta1. This task is to enhance METplus to make the setting of hss_ec_value a configurable option for these tools.

Time Estimate

4 hours.

Sub-Issues

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No sub-issues needed.

Relevant Deadlines

4.1.0-beta2

Funding Source

2700041

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[georgemccabe]

This is a sub-issue of #896