out with newest autotools

http://lists.debian.org/debian-devel-announce/2006/03/msg00003.html

because the + was being interpreted by grep -E, I've escaped it
so it will properly be removed

somewhere along the chain you will only backup the symlink, and
not the data, this is fixed here in rdiff with this change

since Makefile.in is generated through autogen.sh or autoreconf, it shouldn't be
put in the repo itself (except on release)

configure.in modified to be more selective about finding bash
configure.in modified for 0.9.3 release
autogen.sh modified to create config.guess and config.sub for release
changelog updated about autoconf changes
Removed /bin/bash TODO line

- rdiff: it's now possible to choose exactly which vservers should be
         backed-up, as it already was with duplicity handler, with the
	 "vsnames" configuration setting