Tidy up "services_dnsmasq" XHTML

Add "closehead" variable and manually close HEAD
Add CDATA sections to scripts
Add SUMMARY to tables
Update HTML Boolean operators
Close INPUT
Move TFOOT between THEAD and TBODY (quirk of HTML)
Move NOWRAP into class statement
Close IMG and add ALT
Deprecate ampersand
Add table row, but don't display it
Remove duplicate opening and closing TR tags
Add missing closing BODY tag and closing HTML tag