git-svn-id: http://svn.digium.com/svn/asterisk/trunk@158449 f38db490-d61c-443f-a65b-d21fe96a405b
git-svn-id: http://svn.digium.com/svn/asterisk/trunk@157739 f38db490-d61c-443f-a65b-d21fe96a405b
also, move UPGRADE.txt to UPGRADE-1.6.txt and make the new UPGRADE.txt contain information about upgrading between Asterisk 1.6 releases git-svn-id: http://svn.digium.com/svn/asterisk/trunk@157706 f38db490-d61c-443f-a65b-d21fe96a405b