Merge trunk@1278 into centaur

git-svn-id: http://acl2-devel.googlecode.com/svn/branches/centaur@1283 5d84a466-a78b-0930-a311-59b22171a541
Merge trunk@1282 into centaur

git-svn-id: http://acl2-devel.googlecode.com/svn/branches/centaur@1284 5d84a466-a78b-0930-a311-59b22171a541