[TYPO3-core] RFC #14027: Tweak: Add "tiff" to imagefile_ext array

[Christian Kuhn]

Hey,

Søren Malling wrote:
> Problem:
> Different application offers to possibility to save images as ".tiff"
> including the screenshot tool in Mac OSX. It's not possible to use
> this image extension in TYPO3 without adding it to the imagefile_ext
> in the install tool

AFAIK .tif is the valid file extension (rfc 3302), but both .tif and 
.tiff are listed as image/tiff media in MIME, so it should be ok to add 
.tiff to config_default.
+1, please go ahead Dmitry.

Regards
Christian