hardened the addChild function added accessors needed for xmlNode, a bit

* tree.c: hardened the addChild function
* python/generator.py python/libxml.c python/libxml2-python-api.xml
  python/libxml2class.txt python/libxml_wrap.h python/TODO:
  added accessors needed for xmlNode, a bit more testing and
  extension of interfaces
* python/tests/Makefile.am python/tests/build.py: added a test
  build from scratch/save/load/check
Daniel

python/tests/build.py

@@ -0,0 +1,59 @@
+#!/usr/bin/python -u
+import libxml2
+import sys
+
+# Memory debug specific
+libxml2.debugMemory(1)
+
+doc = libxml2.newDoc("1.0")
+comment = doc.newDocComment("This is a generated document")
+doc.addChild(comment)
+pi = libxml2.newPI("test", "PI content")
+doc.addChild(pi)
+root = doc.newChild(None, "doc", None)
+ns = root.newNs("http://example.com/doc", "my")
+root.setNs(ns)
+elem = root.newChild(None, "foo", "bar")
+elem.setBase("http://example.com/imgs")
+elem.setProp("img", "image.gif")
+doc.saveFile("tmp.xml")
+doc.freeDoc()
+
+doc = libxml2.parseFile("tmp.xml")
+comment = doc.children
+if comment.type != "comment" or \
+   comment.content != "This is a generated document":
+   print "error rereading comment"
+   sys.exit(1)
+pi = comment.next
+if pi.type != "pi" or pi.name != "test" or pi.content != "PI content":
+   print "error rereading PI"
+   sys.exit(1)
+root = pi.next
+if root.name != "doc":
+   print "error rereading root"
+   sys.exit(1)
+ns = root.ns()
+if ns.name != "my" or ns.content != "http://example.com/doc":
+   print "error rereading namespace"
+   sys.exit(1)
+elem = root.children
+if elem.name != "foo":
+   print "error rereading elem"
+   sys.exit(1)
+if elem.getBase(None) != "http://example.com/imgs":
+   print "error rereading base"
+   sys.exit(1)
+if elem.prop("img") != "image.gif":
+   print "error rereading property"
+   sys.exit(1)
+
+doc.freeDoc()
+
+# Memory debug specific
+libxml2.cleanupParser()
+if libxml2.debugMemory(1) == 0:
+    print "OK"
+else:
+    print "Memory leak %d bytes" % (libxml2.debugMemory(1))
+    libxml2.dumpMemory()