Rework the directory layout for attachments. There were two problems

with the old approach, as pointed out by Michael Meltzer:

- it was broken <wink>
- it was still susceptible to inode overload

The fixes are to put attachments one more directory level down, where
the path is

    archives/private/<listname>/attachments/<YYYYMMDD>/<msgidhash>

where YYYYMMDD is the date of the message encoded as 8 digits, and the
msgidhash is the first 2 and last 2 octets of the sha hash of the
outer message's Message-ID.  Any name collisions inside that directory
(e.g. a message that contains two images with the same filename), are
resolved by finding a unique filebase extension.

Specific changes include:

calculate_attachments_dir(): Factor out the calculate of the
attachments directory so that e.g. Michael can use it in his
MimeDel.py hacks.

process(): Be sure to pass the appropriate arguments to
save_attachment() based on its new signature.

makedirs(): Factor out the creation and mod settings of the attachment
dir, and all subdirs.

save_attachment(): Pass the attachments directory in the arguments.
Fix calculation of the url and the saving of the attachment data.

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