Issue #2803: updated CHANGELOG.txt and AUTHORS.txt, updated version number and fixed two bugs for releasing v2.1.6
Issue #2803: correct a mistake in AUTHORS.txt
Issue #2803: update a wiki link
Merge pull request #1133 from dingpinglv/Iss2803_V2.1.6Release

Issue #2803: Updated CHANGELOG.txt and AUTHORS.txt, updated version number and fixed two bugs for releasing v2.1.6