hard to discover how to remove a project from a project group

Brian Aker reports:

>>> I have some dead projects in this https://launchpad.net/gearman  <-- I have no idea how to remove them. The interface for this is just not obvious.

The answer is to go to the project in question, click "Change details", scroll down and blank out the "part of" field. But perhaps there should be a ui that is reachable from the project group page near the list of subprojects.