fpdoc: new utility to generate a PDF with the footprints used in a project

- fab/pos2fab: can be called with "do", to read .pos and .cmp file
- fpd2pdf/fpd2pdf: added syntax extension file.fpd:package to allow
  selection of a single package
- fpd2pdf/fpdoc: generate a PDF with the footprints used in a specific
  project

fab/pos2fab

@@ -19,10 +19,12 @@ sub usage
 }
 
 
-&usage unless @ARGV == 2;
+if (!defined caller) {
+	&usage unless @ARGV == 2;
 
-$pos = $ARGV[0];
-$cmp = $ARGV[1];
+	$pos = $ARGV[0];
+	$cmp = $ARGV[1];
+}
 
 open(FILE, $pos) || die "$pos: $!";
 while (<FILE>) {
@@ -55,6 +57,8 @@ while (<FILE>) {
 }
 close FILE;
 
+return 1 if defined caller;
+
 print "\"Ref\",\"Footprint\",\"PosX(in)\",\"PosY(in)\",\"Rot(ccw)\"\n" || die;
 for (@order) {
 	print "\"$_\",\"$fp{$_}\",$pos{$_}[0],$pos{$_}[1],$pos{$_}[2]\n" ||