Add maintenance makefile rule and XSLT transform to generate a unified header of all library functions for analysis purposes.

git-svn-id: http://lufa-lib.googlecode.com/svn/trunk@2696 d5102386-fcda-11dd-9fdb-3debd5008f28
Don't generate the full HTML documentation when only needing the XML version for post-processing.

git-svn-id: http://lufa-lib.googlecode.com/svn/trunk@2697 d5102386-fcda-11dd-9fdb-3debd5008f28
Add some missing function attributes.

git-svn-id: http://lufa-lib.googlecode.com/svn/trunk@2698 d5102386-fcda-11dd-9fdb-3debd5008f28