[Bug-apl] ⎕RE merged

[Juergen Sauermann]

Hi, I have merged Elias' ⎕RE implementation into GNU APL. Thanks, Elias, for contributing it. See 'info apl' for a description and src/testcases/Quad_RE.tc for examples of how to use ⎕RE. SVN 1012. Enjoy, /// Jürgen