#4 Fix for print() on closed filehandle XML

[Ariel Shkedi]

Change line 1025 from:

build_xml($xml_file, $save_file);

to:

build_xml("$save_file.xml", $save_file);

This is not enough to make things work properly, but it made me an xml file I can feed to rrdtool, so I'm stopping here.

[Ariel Shkedi]

This tool is really buggy. It wrote the header fields wrong - it wrote min,max,type, etc as blank.

I was able to copy them from a dump I made using rrdtool, and then I was able to import the edited file.