Merge branch 'ak/pretty-decorate-more'

"git log --format" has been taught the %(decorate) placeholder. * ak/pretty-decorate-more: decorate: use commit color for HEAD arrow pretty: add pointer and tag options to %(decorate) pretty: add %(decorate[:<options>]) format decorate: color each token separately decorate: avoid some unnecessary color overhead decorate: refactor format_decorations() pretty-formats: enclose options in angle brackets pretty-formats: define "literal formatting code"