implementing xs:all with minOccurs = 0 added more tests covering xs:all

* xmlregexp.c xmlschemas.c include/libxml/xmlautomata.h:
  implementing xs:all with minOccurs = 0
* tes/schemas/* result/schemas/*: added more tests covering
  xs:all
Daniel
diff --git a/result/schemas/all_1_0 b/result/schemas/all_1_0
new file mode 100644
index 0000000..08eb108
--- /dev/null
+++ b/result/schemas/all_1_0
@@ -0,0 +1 @@
+./test/schemas/all_0.xml validates