No Python 3 support for py-jinja2.
Revert, py-jinja2 has to adjust.
Do not mark as incompatible with Python 3.x as moneyguru needs it.
Should be fixed properly.
Update to 1.20.6

Upstream changes:
MediaWiki 1.20.6 [edit]

This is a security and maintenance release of the MediaWiki 1.20 branch.
Changes since 1.20.5 [edit]
(bug 48306) SECURITY: Run file validation checks on chunked uploads, and chunks of upload, during the upload process.
(bug 44327) mediawiki.user: Use session ID instead of 1-year cross-session cookies
(bug 47202) wikibits: FF2Fixes.css should not be loaded in Firefox 20.
(bug 31044) Make ResourceLoader behave in read-only mode
Updated www/mediawiki to 1.20.6
add the lockf package: freebsd's lockf for compatibility and building
Updated sysutils/lockf to 1
add nodejs package, previously in wip/node
Updated lang/nodejs to 0.10.6