Deleting obsolete file sum-list-example.lisp, which was long ago incorporated into :doc guard-example.

git-svn-id: http://acl2-devel.googlecode.com/svn/trunk@1146 5d84a466-a78b-0930-a311-59b22171a541
Deleting obsolete function copy-acl2.

git-svn-id: http://acl2-devel.googlecode.com/svn/trunk@1147 5d84a466-a78b-0930-a311-59b22171a541