7066: Reapply from trunk sdn version reporting

Merged from
	commit dbae40dd1edad52023b828d5eef0fe7eb3684fb6
	Author: Vassilii Khachaturov <vassilii@tarunz.org>
	Date:   Sat Sep 14 19:42:48 2013 +0000

		7066: use sdn module from Calendar package on pypi

		Unfortunately, no package on ubuntu for sdn...

		Bug fixed on trunk, when sdn is present on the system.
		Verified that sdn roundtrip works.
		date_test now fails on 1789-13-4(French) recognized as invalid,
		as it probably should -- I guess this one is a test bug.

		git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/trunk@23127 4ae1f11a-8b86-4847-b8af-ab372f36d1fd

	M       gramps/gen/lib/calendar.py
--->M       gramps/grampsapp.py

git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/branches/maintenance/gramps40@23132 4ae1f11a-8b86-4847-b8af-ab372f36d1fd
6774: Recursive call in GEDCOM export preview calculation

git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/branches/maintenance/gramps40@23136 4ae1f11a-8b86-4847-b8af-ab372f36d1fd