vialtray: more parameter adjustments

- tray.pl (zf): lower floor by another mm, leaving 3-4 mm of material
- tray.pl (vd): increase vial diameter by 0.1 mm to allow for vial
  tolerance and material expansion. Also, working from the inside to the
  outside (instead of plunging into uncut material first) decreased the
  hole radius slightly.
- tray.pl (do_cols, do_circles): removed exclusion of the first column

  radius after vial
  tolerance,

vialtray/tray.pl

@@ -111,7 +111,7 @@ sub circ
 $z0 = -0.5;
 
 # floor depth
-$zf = -17;
+$zf = -18;
 
 # maximum depth step
 $zs = 2.5;
@@ -123,7 +123,7 @@ $xs = 24;
 $ys = 20;
 
 # vial diameter
-$vd = 18.6;
+$vd = 18.7;
 
 # minimum wall thickness
 $mw = 2.5;
@@ -218,9 +218,7 @@ sub do_cols
 
 	$x = $x0;
 	for ($c = 0; $c != $nc; $c++) {
-if ($c) {
 		&do_col($x);
-}
 		$x += $xs;
 		print "\n";
 	}
@@ -237,9 +235,7 @@ sub do_circles
 		$y = $y0;
 		for ($rw = 0; $rw != $nr; $rw++) {
 			for ($rr = $r0; $rr <= $r1; $rr += $rs) {
-if ($c) {
 				&circ($x, $y, $rr, 180);
-}
 			}
 			print "\n";
 			$y += $ys;