git-cola 2.0.4

Closes #31142.
hub: stable branch for HEAD.

Master branch is becoming very unstable really soon and switching from
Ruby to Go, so people that use `brew install hub --HEAD` will have a
really rough time during that.

Closes #31138.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
imagemagick: add enable-hdri option.

Closes #30439.
gnuplot: make aquaterm support default to off.

Needed for the bottle to behave as expected.

Closes #31096.
gnuplot: update 4.6.5 bottle.