Merge pull request #790 from kivikakk/release/v0.52.0

Release v0.52.0.

Merge pull request #770 from kivikakk/release/v0.51.0

Release v0.51.0.

Merge pull request #738 from kivikakk/release/v0.50.0

Release v0.50.0.

Merge pull request #706 from kivikakk/release/v0.49.0

Release v0.49.0.

Merge pull request #690 from kivikakk/release/v0.48.0

Release v0.48.0.

CHANGELOG: fix diff link.

Merge pull request #660 from kivikakk/release/v0.46.0

Release v0.46.0.

Merge pull request #645 from kivikakk/release/v0.45.0

Release v0.45.0.

Merge pull request #638 from kivikakk/release/v0.45.0-rc.1

Release v0.45.0-rc.1.

Merge pull request #620 from kivikakk/release/v0.44.0

Release v0.44.0.