Added an option for not reading all LEF files along with DEF files, but only selected ones.

testdata/lefdef/masks-1/hidden/in_tech.lef

@@ -0,0 +1,32 @@
+LAYER M0PO 
+    TYPE MASTERSLICE ;
+    WIDTH 0.02 ;
+    MASKS 2 ;
+END M0PO
+LAYER VIA0
+    TYPE CUT ;
+    MASKS 2 ;
+END VIA0
+LAYER M1
+    TYPE MASTERSLICE ;
+    WIDTH 0.024 ;
+    MASKS 2 ;
+END M1
+LAYER VIA1
+    TYPE CUT ;
+    MASKS 2 ;
+END VIA1
+LAYER M2
+    TYPE MASTERSLICE ;
+    WIDTH 0.03 ;
+    MASKS 2 ;
+END M2
+
+VIA square 
+    LAYER M0PO ;
+        RECT -0.08 -0.08 0.08 0.08 ;
+    LAYER VIA0 ;
+        RECT -0.08 -0.08 0.08 0.08 ;
+    LAYER M1 ;
+        RECT -0.08 -0.08 0.08 0.08 ;
+END square

testdata/lefdef/masks-1/in_tech.lef

@@ -9,7 +9,7 @@ LAYER VIA0
 END VIA0
 LAYER M1
     TYPE MASTERSLICE ;
-    WIDTH 0.025 ;
+    WIDTH 0.024 ;
     MASKS 2 ;
 END M1
 LAYER VIA1

testdata/ruby/dbReaders.rb

@@ -353,6 +353,10 @@ class DBReaders_TestClass < TestBase
     conf.lef_files = [ "u.lef", "v.lef" ]
     assert_equal(conf.lef_files.join(","), "u.lef,v.lef")
 
+    assert_equal(conf.read_lef_with_def, true)
+    conf.read_lef_with_def = false
+    assert_equal(conf.read_lef_with_def, false)
+
   end
 
   # MAG Options