GitLab

the attribute sparkle:version was ill formed
(date in format %Y/%m/%d instead of %Y%m%d),
making new versions outdated during publishing
because of the lexicographic ordering in winsparkle.

Change-Id: Ieb8d10ce346c27d27dd1a82dddb05414d9e839ed

added script winsparkle.py to maintain the rss light and beeing
able to suppress cleanly versions of the same day when publishing.
It will also be easier to further implement other tests on the
rss to erase older items from the channel if needed.

Change-Id: I99d6ead3f180ce642a81e0c308c6a10efdd06dea