Add benchmark for our DTGBA SAT-minimization.

* bench/dtgbasat/: New directory.
* bench/Makefile.am: New file.
* configure.ac, README: Adjust.

bench/dtgbasat/rundbamin.pl

@@ -0,0 +1,17 @@
+#!/usr/bin/perl -w
+
+use strict;
+use Time::HiRes;
+
+my $start = Time::HiRes::gettimeofday();
+my $res = `@ARGV` || die;
+my $end = Time::HiRes::gettimeofday();
+
+if ($res =~ /States:\s*(\d+)\w*$/som)
+{
+    printf("%d, %f\n", $1, $end - $start);
+}
+else
+{
+    printf("-, -\n");
+}