[PATCH 03/10] parsemail: Add series parsing

[Russell Currey]

On Mon, 2016-06-13 at 11:41 +0100, Stephen Finucane wrote:
> It is now possible to parse and store series, so do just that.
> The parsing at the moment is based on both RFC822 headers and
> subject lines.
> 
> Signed-off-by: Stephen Finucane <stephen.finucane at intel.com>
> ---

There might have been some edge cases this fails to parse, but for everything I
saw series were parsed correctly.

Tested-by: Russell Currey <ruscur at russell.cc>