[Cooker] perl upgrades

[Adam Williamson]

Since the current perl upgrades are something of a major change, I (and
I think probably other people) are a bit nervous to try and update my
Cooker now. Would it be possible for Pixel to send an 'all clear'
message to the list when he thinks everything that needs to be updated
has been updated and a Cooker update should go off correctly? Thanks in
advance. And kudos for the quick work on recompiling everything =)
-- 
adamw