3.0.0 release

Fix make distcheck

Add 'index' label for the landing page to be used by another project

Set the next version to 2.0.3 and populate the changelog.

Update for 2.0.2.

Fix typo.

Add what's new in 2.0.0.

Update the CHANGELOG.

Up the version to 1.6.0.

Fix make distcheck and up the version to 1.5.0.