GEP18: add deprecated decorator to gramps, use in src and citation
Usage: python -W all Gramps.py


git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/branches/geps/gep-018-evidence-style@22622 4ae1f11a-8b86-4847-b8af-ab372f36d1fd