fixed a serious problem when substituing entities using the Reader, the

* parser.c xmlreader.c include/libxml/parser.h: fixed a serious
  problem when substituing entities using the Reader, the entities
  content might be freed and if rereferenced would crash
* Makefile.am test/* result/*: added a new test case and a new
  test operation for the reader with substitution of entities.
Daniel
diff --git a/result/wml.xml.rde b/result/wml.xml.rde
new file mode 100644
index 0000000..1bb28d4
--- /dev/null
+++ b/result/wml.xml.rde
@@ -0,0 +1,24 @@
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+1 14 #text 0 1 
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+4 3 #text 0 1 Cinéma
+3 15 a 0 0
+3 1 br 1 0
+3 14 #text 0 1 
+	
+2 15 p 0 0
+2 14 #text 0 1 
+
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+1 15 card 0 0
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