Add check to the Doxygen->Docbook transform to warning on untemplated items. Add additional templates to ensure the output documentation does not have unescaped or unformatted entries.

git-svn-id: http://lufa-lib.googlecode.com/svn/trunk@2748 d5102386-fcda-11dd-9fdb-3debd5008f28
Minor documentation improvements.

git-svn-id: http://lufa-lib.googlecode.com/svn/trunk@2749 d5102386-fcda-11dd-9fdb-3debd5008f28
Revert incorrect XMEGA interrupt disable patch; all flags *except* the interrupt level should be cleared, and not the interrupt level itself.

git-svn-id: http://lufa-lib.googlecode.com/svn/trunk@2750 d5102386-fcda-11dd-9fdb-3debd5008f28