Release 0.4.4 stable (on time?)

This is a tracking ticket for our 0.4.4 stable release, which is scheduled for 15 September. We can, of course, defer if needed.

Here are some things we should do before 0.4.4 is stable:

• Ensure that every ~044-must ticket is fixed, or relabeled as not truly being must-fix for 0.4.4.
• Review all remaining ~044-should tickets and make sure that we are okay releasing without fixing any that remain. Fix all of the ones that are necessary, reclassifying them as ~044-must if needed.
• Put out a release candidate in late August or early September, if there are significant changes since 0.4.4.4-rc
• Write a changelog and releasenotes. (Nick is happy to do this when he's back.)