Update "status_rrd_graph.php" XHTML

Update SCRIPT statements with CDATA
Move the close HEAD statement
Move the FORM statement outside the main table
Close INPUT tag
Update HTML Boolean operators
Add closing table cell (TD) and table row (TR) tags so that the rows are
closed properly before the IMG (RRD graph) tags
Tidy up the IMG (RRD graph) tag
Close HR tag
Merge pull request #809 from ExolonDX/branch_02

Update "status_rrd_graph.php" XHTML