The most important and non-optional dependencies should go first, so put
them there. While we're moving them, the descriptions for shell and perl
were archaic, referring to "bare-bones Porcelainish scripts" that have
become powerful and essential.
Signed-off-by: Brian Gernhardt <brian@gernhardtsoftware.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>