Tidy up "traffic shaper limiter" XHTML

Close INPUT, BR, IMG and P tags
Add "alt" to IMG tags
Deprecate ampersand in ANCHOR tags
Add CDATA section to scripts
Move "tree.css" and "tree.js" to the HEAD statement and manually close
the HEAD statement
Spelling mistatke
Updated PHP shorthand tag
Merge pull request #491 from ExolonDX/branch_03

Tidy up "traffic shaper limiter" XHTML