share: be more explicit about the dangers of rollback.

mercurial.spec: Alignment with AIX spec by Jim Hague * Require Python 2.4 or later * Note that hgk uses tk - but don't require it * Remove bashism to support ksh * Install mq.el * Handle uncompressed man pages

hgweb: changenav: separate pages before and after the current position This should allow styles to customize more precisely navigation bar, for example inserting a cursor to show where we are in the navigation bar.