lei_saved_search: expand only/include/exclude to absolute paths
While users may specify relative paths for convenience on the
command-line, absolute paths are required for `lei up' since
that (especially `lei up --all') could run from anywhere.
Note that we need to do this when parsing the command-line
options, since shortcuts for URL matching on URL path components
are allowed for `lei q', and those same shortcuts may remain
in effect across to `lei up' as the underlying external may
be moved to a different URI host.