Merge pull request #43 from wookietreiber/perl-shebangs

use more portable /usr/bin/env perl for scripts

qualfa2fq.pl

@@ -1,4 +1,4 @@
-#!/usr/bin/perl -w
+#!/usr/bin/env perl
 
 use strict;
 use warnings;

xa2multi.pl

@@ -1,4 +1,4 @@
-#!/usr/bin/perl -w
+#!/usr/bin/env perl
 
 use strict;
 use warnings;