#264 Does not update files with same name

[sjmerel]

If a feed reuses a filename that has been downloaded
before for a new file, iPodder will not download the
new file, even if the <pubDate> field indicates that it
is new.

I found this when subscribing to
www.scompt.com/dwelle.rss, which is a feed that
references mp3 files of news broadcasts from the
Deutsche Welle web server. Each broadcast is named with
the day of the week (dlmnr_mon.mp3 for Monday's
broadcast, etc) so the filenames are reused every week.

[Radu]

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Same problem with the NASA podcast
(http://science.nasa.gov/podcast.xml), where all podcasts
have the same filename (story.mp3), just the folder differs.
Maybe a way to fix this is to add a unique string to the
filename (e.g. date, time of downloading or folder name).