"Leave-on-disk" MIME parsing

[Philip Van Hoof <spam pvanhoof be>]

I just committed "leave-on-disk" MIME parsing to Tinymail's camel-lite.

Mind that this is highly experimental code.

The two commits that should be combined to prepare the patch for
upstream are:

http://tinymail.org/trac/tinymail/changeset/3462 and
http://tinymail.org/trac/tinymail/changeset/3455

I added Matthew and Jeffrey in CC so that they can review this using
those two diffs already.


The net result of these patches is that opening a truly large E-mail
will not consume the same amount of bytes as the size of the E-mail in
RAM. In stead the MIME parser will use seek() in case the stream
supports this.

We have been updating certain of Tinymail's streams to become seekable:

http://tinymail.org/trac/tinymail/changeset/3454

This was obviously related to all this.


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Philip Van Hoof, freelance software developer
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