[uploader] Free space preserving capability during image uploads

Imported from: http://groups.google.com/group/in-portal-dev/browse_thread/thread/c5bbad92701fb7c9#

There are some hostings (among ones, where In-Portal is used), that have limits per total disk space. Also there are users, who like to upload images with high resolutions.

Since In-Portal store that images as is, then we could spend lots of space just for that purpose.

I propose, that we could resize images before storing them to disk.

resize_images_just_after_uploading.patch

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