Tidy up "traffic shaper layer7" XHTML

Close INPUT, BR, P and IMG tags
Add "alt" to IMG tags
Add CDATA section to scripts
Move "tree.css" and "tree.js" to the HEAD statement and close the HEAD
statement manually
Spelling mistake
Update PHP shorthand tag
Update HTML boolean operators
Merge pull request #492 from ExolonDX/branch_04

Tidy up "traffic shaper layer7" XHTML