Note that the Frugalware driver is not enabled.
README: Note that static libc is required (to build the init).
README: OCaml inifiles is no longer used.
Detect fakeroot for some (broken) package managers.
docs: Minor fix to manual page documentation of --if-newer option.
Add --list-drivers option.
Change the way package handlers are named and register themselves.
configure: Use AC_PATH_PROG for package manager binaries.

Also ensure that we identify all binaries needed by drivers.
build: Change the way that Arch and Frugalware are distinguished.
tests: Add distro-specific tests for Fedora & Debian.
Enable gnulib (again) so we can use non-broken FTS.
Version 5.1.1.