Include Taxonomy and Default conditions in upgrade 6.x-2.x to 6.x-3.x

I am belatedly looking at migrating to Context 6.x-3.x and have rapidly ascertained that neither the Taxonomy nor the Default conditions were included in the update process.

As the site I support makes considerable use of Taxonomy conditions and uses some defaults as well, and being no fan of manually re-configuring dozens of module settings, I took a look at the conversion process and have produced a patch on context.install to add this functionality. The taxonomy is - as far as I know - a straightforward data re-formatting exercise. The default conversion makes use of the tilde and wildcard matching features of the Context 3 "context" condition.

So far I have tested it on a copy of my site and not spotted any snags, so I though it was worth sharing in case anyone else is facing the same hurdle.