Store payload data in files

Review Request #13 - Created Feb. 4, 2009 and submitted

Andras Mantia
Preliminary implementation of storing the payload data in files instead of the database. It work for me, but it is not well tested. I'd like to get a general feedback about the idea how it is implemented (or anything else, if you have a comment). The basic idea is to use a helper class when dealing with Part objects, and the helper class decides where to store/load the data.

Andras Mantia
Volker Krause
Volker Krause
Yes, please go ahead and commit.