Global mode not activated automatically. Windows sizing and positioning problems fixes. Make frame width function configurable, as it might not be possible to find the actual frame width. Dropped the dependency on old-emacs-support.

git-svn-id: https://dropofthesun.com/svn/emacs/repos/multicolumn/branches/github@1008 c1af6f96-8016-4733-90a2-447896f46de0