Merge pull request roots#1621 from roots/8.4.2

Sage 8.4.2

Merge pull request roots#1607 from roots/8.4.1

Sage 8.4.1

Sage 8.4.0

Merge pull request roots#1559 from roots/8.3.0

Sage 8.3.0

Merge pull request roots#1458 from roots/8.2.1

Sage 8.2.1

Merge pull request roots#1440 from roots/8.2.0

Sage 8.2.0

Merge pull request roots#1403 from roots/8.1.1

Sage 8.1.1

Sage 8.1.0

Sage 8.0.1

Merge pull request roots#1251 from roots/8.0.0

Sage 8.0.0