Added a new pad type: trace pads, for antennas and other trace-like elements.

- layer.h (enum pad_type): added pad type pt_trace
- layer.c (pad_type_to_layers, layers_to_pad_type), inst.c (inst_pad):
  "trace" pad instantition and conversion infrastructure
- fpd.y (pad_type), dump.c (print_obj): .fpd file I/O for "trace" pads
- postscript.c (prologue): added Postscript function "horpath" to produce
  horizontal stripes
- postscript.c (hatch): show "trace" pads with horizontal stripes
- gui_style.h (gc_pad_trace), gui_style.c (gc_pad_trace, gui_setup_style),
  gui_inst.c (pad_gc): added visualization of "trace" pads
- gui_status.c (show_pad_type): added "trace" pad type
- README: added description of "trace" pads
- README: added usage examples for the various pad types



git-svn-id: http://svn.openmoko.org/trunk/eda/fped@5998 99fdad57-331a-0410-800a-d7fa5415bdb3

gui_status.c

@@ -1,8 +1,8 @@
 /*
  * gui_status.c - GUI, status area
  *
- * Written 2009, 2010 by Werner Almesberger
- * Copyright 2009, 2010 by Werner Almesberger
+ * Written 2009-2011 by Werner Almesberger
+ * Copyright 2009-2011 by Werner Almesberger
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -204,6 +204,9 @@ static void show_pad_type(void)
 	case pt_bare:
 		s = "bare";
 		break;
+	case pt_trace:
+		s = "trace";
+		break;
 	case pt_paste:
 		s = "paste";
 		break;