[mcclim-devel] Patch for menu-choose.lisp

The current implementation of `menu-choose' lacks a fair bunch of spec-defined functionality (labels, some menu item types, scrollbars), and it often creates menus that are larger than the screen, or partially off-screen. This patch rectifies these problems - I have been running with it for 6+ months and it has worked perfectly, even though some of the code is not the prettiest in the world (my CLIM-fu has been weak). There should be no functionality regressions compared to the current version.

I know that McCLIM is currently in a freeze period, but this patch has been lying on my harddrive for too long - others may find it useful, and I would like it to be cleaned up (if necessary) so it could be included in some future release. :-)