[xml] patch for indenting comments/PIs in xmlsave

[Jason Viers <lists beanalby net>]

When saving a new doc using indent, comments and PIs don't get indented 
like elements do:

<?xml version="1.0"?>
<rootNode>
 <item>child1</item>
<!--commentContents-->
 <item>child2</item>
<?name value?>
 <item>child3</item>
</rootNode>


Right now xmlNodeListDumpOutput indents the list item only if it's an 
element.  The patch changes it to indent if it's an element, comment, or 
processing instruction.

Lemme know if there are any problems or questions.
Jason

--- xmlsave.c   2006-10-16 20:25:06.000000000 -0400
+++ ../xmlsave.c        2007-03-13 12:36:45.951692500 -0400
@@ -623,7 +623,9 @@
     buf = ctxt->buf;
     while (cur != NULL) {
        if ((ctxt->format) && (xmlIndentTreeOutput) &&
-           (cur->type == XML_ELEMENT_NODE))
+           (cur->type == XML_ELEMENT_NODE ||
+             cur->type == XML_COMMENT_NODE ||
+             cur->type == XML_PI_NODE))
            xmlOutputBufferWrite(buf, ctxt->indent_size *
                                 (ctxt->level > ctxt->indent_nr ? 
                                  ctxt->indent_nr : ctxt->level),