Fixes #1694. Remove URLs from MAPL

[mathomp4]

Description

This PR removes URLs (websites and email addresses) from MAPL per the request of NOAA. Note that this means that History output now has a BLANK Contact: global metadatum by default. If you wish to duplicate previous output, you'd want to set:

CONTACT: 'http://gmao.gsfc.nasa.gov'

in HISTORY.rc

There is a PR in GEOSgcm_App to do this for GEOS:

GEOS-ESM/GEOSgcm_App#367

Related Issue

Closes #1694

Motivation and Context

Per request of NOAA.

How Has This Been Tested?

It runs and is zero-diff in the state and in History if HISTORY.rc change is made. Note that one has to specifically compare global metadata to see the History difference without the change.

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