dbmmanage overhaul (see CHANGES)

removed dbmmanage.new
updated dbmmanage.readme

PR:
Obtained from:
Submitted by:	Doug MacEachern
Reviewed by:	Dean Gaudet, Randy Terbush, Marc Slemko


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@78870 13f79535-47bb-0310-9956-ffa450edef68