aXSL Code

Move nextBolder and nextLighter methods from FontUse to Font. Add method to FontConsumer to use that Font to get a FontUse.

Upgrade JUnit to latest version. Fix missing JUnit dependency.

Roll font-content element into font.

Move listing of FontUse instances from FontConsumer to ConsumerFont, to clean up the tree structure.

Provide better information by reporting the list of ConsumerFont instances, which contain pointers to the Font.

Clarify relationships between interfaces be eliminating some shortcuts.

Reintroduce the ConsumerFont interface, as being necessary to keep encoding-related issues separate from font-related issues.

Fix checkstyle config change to JavadocVariable from 10.22.

Upgrade checkstyle to 10.23, to match Eclipse plugin.

Minor doc changes.