Deleting things often left measurements behind. Fixed these bugs, enhanced %del

to also delete frames and items in other frames than the current one, and added
the corresponding regression tests.

- fpd.y, README: %del can now also delete frames
- test/del_frame: regression test for frame deletion
- fpd.y: moved all debug items into debug_item, so that they can be invoked
  after defining measurements
- README: clarified that object labels aren't entirely hidden in the GUI
- delete.c (delete_references): also delete measurements referencing the frame
  (test/del_frame)
- fpd.y (dbg_link_frame): described why we need base_frame in addition to 
  base_vec
- fpd.y, README: %del can now also reach into frames other than the current one
- delete.c (do_delete_vec): also delete references in the root frame, i.e.,
  measurements (tests/del_vec)



git-svn-id: http://svn.openmoko.org/trunk/eda/fped@5947 99fdad57-331a-0410-800a-d7fa5415bdb3

test/del_frame

@@ -0,0 +1,67 @@
+#!/bin/sh
+. ./Common
+
+###############################################################################
+
+fped_fail "delete frame: can't self-destruct" <<EOF
+frame f {
+	%del f
+}
+EOF
+expect <<EOF
+3: a frame can't delete itself near "}"
+EOF
+
+#------------------------------------------------------------------------------
+
+fped_dump "delete frame: content disappears" <<EOF
+frame f {
+	vec @(0mm, 0mm)
+}
+
+%del f
+EOF
+expect <<EOF
+/* MACHINE-GENERATED ! */
+
+package "_"
+unit mm
+EOF
+
+#------------------------------------------------------------------------------
+
+fped_dump "delete frame: references disappear" <<EOF
+frame f {
+	vec @(0mm, 0mm)
+}
+
+frame f @
+
+%del f
+EOF
+expect <<EOF
+/* MACHINE-GENERATED ! */
+
+package "_"
+unit mm
+EOF
+
+#------------------------------------------------------------------------------
+
+fped_dump "delete frame: measurements disappear" <<EOF
+frame f {
+	v: vec @(0mm, 0mm)
+}
+
+meas f.v -> f.v
+
+%del f
+EOF
+expect <<EOF
+/* MACHINE-GENERATED ! */
+
+package "_"
+unit mm
+EOF
+
+###############################################################################

test/del_vec

@@ -0,0 +1,64 @@
+#!/bin/sh
+. ./Common
+
+###############################################################################
+
+fped_dump "delete vector: it disappears" <<EOF
+v: vec @(0mm, 0mm)
+%del v
+EOF
+expect <<EOF
+/* MACHINE-GENERATED ! */
+
+package "_"
+unit mm
+EOF
+
+#------------------------------------------------------------------------------
+
+fped_dump "delete vector: references disappear" <<EOF
+v: vec @(0mm, 0mm)
+line v v
+%del v
+EOF
+expect <<EOF
+/* MACHINE-GENERATED ! */
+
+package "_"
+unit mm
+EOF
+
+#------------------------------------------------------------------------------
+
+fped_dump "delete vector: measurements disappear (same frame)" <<EOF
+v: vec @(0mm, 0mm)
+meas v -> v
+%del v
+EOF
+expect <<EOF
+/* MACHINE-GENERATED ! */
+
+package "_"
+unit mm
+EOF
+
+#------------------------------------------------------------------------------
+
+fped_dump "delete vector: measurements disappear (other frame)" <<EOF
+frame f {
+	v: vec @(0mm, 0mm)
+}
+meas f.v -> f.v
+%del f.v
+EOF
+expect <<EOF
+/* MACHINE-GENERATED ! */
+
+frame f {
+}
+
+package "_"
+unit mm
+EOF
+
+###############################################################################