Merge trunk rev 1147 into centaur

git-svn-id: http://acl2-devel.googlecode.com/svn/branches/centaur@1151 5d84a466-a78b-0930-a311-59b22171a541
Merge trunk into centaur up to rev 1150

git-svn-id: http://acl2-devel.googlecode.com/svn/branches/centaur@1152 5d84a466-a78b-0930-a311-59b22171a541