Prepare for v7.1.2 (ruflin#2000)

Add changelog entry for changes since 6.1.5

Prepare 7.1.1 release (ruflin#1924)

Prepare 6.1.5 release (ruflin#1951)

Prepare 6.1.4 release (ruflin#1919)

Prepare 6.1.3 release (ruflin#1904)

Prepare 6.1.2 release (ruflin#1901)

Prepare 7.1.0 release (ruflin#1871)

Prepare 7.0.0 release (ruflin#1784)

Update changelog accordingly.

Prepare for release 7.0.0-beta.4 (ruflin#1768)