(with Jared, from a while ago) add ttagged fast-alist-pop utility

git-svn-id: http://acl2-books.googlecode.com/svn/trunk@2577 303c5b2c-9740-0410-b014-fd8f9db7be32
Add bit->bool function (same as (equal x 1)) and use it in bitops library; leave it enabled for backward compatibility

git-svn-id: http://acl2-books.googlecode.com/svn/trunk@2578 303c5b2c-9740-0410-b014-fd8f9db7be32