Update the table of releases (6.1.1 replaces 6.1.0), and create
the associated release file.

This adds the source for 6.1.0.

Update the table of releases with 6.1.0, and create the associated
release file.

This adds the source for 6.1.0.

Update the table of releases with 6.0.1, and create the associated
release file.

This adds the source for 6.0.1.

Also remove a trailing whitespace that was screaming at me.

Add syntax plugin for Jetbrains IDEs

Ref: a3fd0b06

You make me happy, @bsdphk