2020.0.0-alpha1. This commit: 1. Deletes shells/ksh93, completed by r502844. 2. svn copies shells/ksh93-devel to shells/ksh93 -- this commit. 3. Replaces the git tag with DISTVERSION 2020.0.0-alpha1 -- this commit. PR: 237332 Reviewed by: crees@ Approved by: maintainer timeout Reminded by: Siteshwar Vashisht <svashisht@redhat.com> (ksh93 upstream maintainer)