Deleting emails from gui does not remove deduplicated attachment files.

[HgoAlv]

We have been trying the option for deleting emails from the gui (ie, marking them as expired and letting pilerpurge.py do its job) and it seems to work ok but only if the email does not have deduplicated attachments. In this case, deleting all but one of the emails referencing the attachment correctly keeps the attachment file, but deleting de last referencing email does not delete de attachment file, effectively leaving an orphan in the filesystem.

[Janos SUTO]

I’ll test it for myself, and keep you posted.

[Janos SUTO]

This commit should fix this issue: https://bitbucket.org/jsuto/piler/commits/f7cc52433ccda8137ecc6e9068f41a04981c0ac8