Fixed over 500 compile warnings. Mostly:

* Unused variables.
* Missing newlines at ends of #included files.
* signed int loop variables where the termination condition is an unsigned 'get number of' function.
* 'NULL' used inappropriately for an integer or character constant (NULL is a pointer)
* abstract base classes with no virtual destructor.
* Floating point constants used to initialise integer variables.

Extras/LibXML/schematron.c

@@ -722,6 +722,7 @@ xmlSchematronFreeParserCtxt(xmlSchematronParserCtxtPtr ctxt)
  *
  * Add an included document
  */
+#if 0
 static void
 xmlSchematronPushInclude(xmlSchematronParserCtxtPtr ctxt,
                         xmlDocPtr doc, xmlNodePtr cur)
@@ -754,6 +755,7 @@ xmlSchematronPushInclude(xmlSchematronParserCtxtPtr ctxt,
     ctxt->includes[2 * ctxt->nbIncludes + 1] = (xmlNodePtr) doc;
     ctxt->nbIncludes++;
 }
+#endif
 
 /**
  * xmlSchematronPopInclude:
@@ -996,6 +998,7 @@ xmlSchematronParsePattern(xmlSchematronParserCtxtPtr ctxt, xmlNodePtr pat)
  *
  * Returns the updated node pointer
  */
+#if 0
 static xmlNodePtr
 xmlSchematronLoadInclude(xmlSchematronParserCtxtPtr ctxt, xmlNodePtr cur)
 {
@@ -1051,6 +1054,7 @@ done:
         xmlFree(URI);
     return(ret);
 }
+#endif
 
 /**
  * xmlSchematronParse: