Flags and the 2.18 push

[Gervase Markham]

David Miller wrote:

> Mozilla's been using Flags for this...  should we start doing that for
> Bugzilla as well?  The net result would probably be easier searches as well.

Sounds very sensible to me.

We need an approval flag per-branch, and a blocking flag per-release, as 
you say.

We can remove the blocking flags a couple of releases after the release 
in question.

Gerv