ExtData2G updates, bugs fixes and multiple filestream feature.

[bena-nasa]

This is more development of ExtData 2.0
This fixes multiple bugs uncovered when testing with the real GEOSgcm system rather than my standalone tester.

This also implements the requested feature to use different rules for different time periods

Description

Related Issue

Motivation and Context

How Has This Been Tested?

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Trivial change (affects only documentation or cleanup)

Checklist:

• I have tested this change with a run of GEOSgcm (if non-trivial)
• I have added one of the required labels (0 diff, 0 diff trivial, 0 diff structural, non 0-diff)
• I have updated the CHANGELOG.md accordingly following the style of Keep a Changelog

[tclune]

Much better. Still a couple of small changes requested.

[tclune]

Note - there are levels of debugging even lower than "DEBUG". The named levels are DEBUG, INFO, WARN, ... but they correspond to integers 10, 20, 30, ...

So you could make those "DEBUG" something like "9" and then they would only show up when you set the logger threshold to "9".