This code dates from before Go 1.0. LGTM=crawshaw R=crawshaw CC=golang-codereviews https://codereview.appspot.com/206860043
Fix bug where the String representation of a Fix32 representing minus one quarter was "0:064" instead of "-0:064". R=r, rsc, rog, nigeltao_gnome CC=golang-dev http://codereview.appspot.com/2275043