Bump version to 2.0.
Note that configure hadn't been checked in a few times so it has more
changes, catching up with the last few changes to congifure.in as
well.
diff --git a/configure.in b/configure.in
index 5790801..c7174f1 100644
--- a/configure.in
+++ b/configure.in
@@ -6,7 +6,7 @@
# Set VERSION so we only need to edit in one place (i.e., here)
AC_SUBST(VERSION)
-VERSION=1.6
+VERSION=2.0
# NEXTSTEP stuff
if test -f /usr/lib/NextStep/software_version -o -f /System/Library/CoreServices/software_version ; then