1.1.3dev: Added `label` attribute and deprecated `name` attribute. Refs #11828.

When neither `label` nor `name` is not specified, the `label` will be formed by replacing underscores with whitespace in the label `name`.


git-svn-id: http://trac.edgewall.org/intertrac/log:/trunk@13432 af82e41b-90c4-0310-8c96-b1721e28e2e2