[dev] PNG optimization for IE

[Jan Schneider]

Zitat von Jan Schneider <jan at horde.org>:

> I'm not sure about the icons with the black background, but I guess these
> had somehow a black background set when creating the transparency, it
> should be possible to convert them to at least a white background if not to
> indexed transparency and a transparent background.

Most of the black icons (the ones from the tree/ folder) have just been
fixed.

Jan.

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