[FEATURE] indexing arbitrary headers

[Łukasz Stelmach]

Hi,

I'd like to ask for a new feature: indexing of arbitrary headers. Not
all headers but a few selected by users.

For example, I get a lot of mails from a Gerrit system. I'd like to keep
them for a while and remove them when they are old enough. Although
these messages are distinguishable in my inbox, they've got subjects
like "Change in ..." and are from "nobody". But these may happen in
other e-mails too. The only 100% sure way to distringuish those e-mails
is to look for headers Gerrit adds.

Kind regards,
-- 
Łukasz Stelmach
Samsung R&D Institute Poland
Samsung Electronics
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