Added relaxation of pad overlap checking. Not GUI-settable yet.

- README, fpd.l, fpd.y: added directives "allow touch" and "allow overlap" to
  make overlap checking more permissive
- dump.c (dump_allow, dump): generate "allow" directive
- obj.h, obj.c (allow_overlap): added global variable for strictness of overlap
  checking
- overlap.h, overlap.c (overlap, ...), layer.h, layer.c (refine_layers):
  strictness of overlap checking is passed as an argument
- hole.c (check_through_hole), layer.h, layer.c (refine_copper), obj.c
  (instantiate): updated callers of "overlap" to provide "allow" argument



git-svn-id: http://svn.openmoko.org/trunk/eda/fped@5974 99fdad57-331a-0410-800a-d7fa5415bdb3

obj.c

@@ -22,6 +22,7 @@
 #include "meas.h"
 #include "inst.h"
 #include "hole.h"
+#include "overlap.h"
 #include "layer.h"
 #include "delete.h"
 #include "obj.h"
@@ -37,6 +38,7 @@ char *pkg_name = NULL;
 struct frame *frames = NULL;
 struct frame *active_frame = NULL;
 void *instantiation_error = NULL;
+enum allow_overlap allow_overlap = ao_none;
 
 
 static struct bitset *frame_set; /* frames visited in "call chain" */
@@ -498,7 +500,7 @@ int instantiate(void)
 	if (ok)
 		ok = link_holes();
 	if (ok)
-		ok = refine_layers();
+		ok = refine_layers(allow_overlap);
 	if (ok)
 		ok = instantiate_meas(n_frames);
 	if (ok)