get rid of getFileFieldContentType method
listSyndicatableContent should use ExtendedPathindex in query on Plone 2.1+


itunes related:
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- add length of video file from a atvideo object to atvideo_item.pt like in ataudio_item.pt
- add categories to the channel for itunes feed
- add <itunes:keywords> for an item aggregated from the keywords of the object or tags(?)
- subtitle for items and channel (maybe take first sentence of description)
- add tab for smartfolder to configure the itunes related parameters (enable itunes support, channel image,...)
- strip html tags from <itunes:summary> and <itunes:subtitle>, substitute <br /> and </p> with a new line (\n)

maybe add a check for the type of the items (mp3, m4a, m4v, mp4, mov, ..) that itunes understand, otherwise output
an error - dont know how to implement that, maybe its not possible at all