Cleanup, cleanup .. removed libxml softlink for good cleanup to get 100%

Cleanup, cleanup ..
* configure.in Makefile.am: removed libxml softlink for good
* include/libxml/*.h *.c doc/Makefile.am: cleanup to get
  100% coverage by gtk-doc
Daniel
diff --git a/libxml.h b/libxml.h
index 2954ccb..c8f7676 100644
--- a/libxml.h
+++ b/libxml.h
@@ -19,6 +19,12 @@
 #ifdef WITHOUT_TRIO
 #include <stdio.h>
 #else
+/**
+ * TRIO_REPLACE_STDIO:
+ *
+ * This macro is defined if teh trio string formatting functions are to
+ * be used instead of the default stdio ones.
+ */
 #define TRIO_REPLACE_STDIO
 #include "trio.h"
 #endif