Just changed "OpenGeoSys Community" to "COPYRIGHT HOLDERS AND
CONTRIBUTORS" in the last paragraph.

Before this change GitLab classified the license as "Other" and not
"BSD 3-clause".

BSD-3-Clause is an approved OSI license.

- https://opensource.org/licenses/BSD-3-Clause
- https://en.wikipedia.org/wiki/BSD_licenses

Clang format run on near-the-header lines.

Happy New Year

This reverts commit 05677165.

Conflicts:
	FileIO/XmlIO/XmlGspInterface.cpp
	README.md