Jonas Lundman modifications

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Requests and contributions from the support forum, take 2.

• http://wordpress.org/support/topic/consider-som-logic-and-fixes
• http://wordpress.org/support/topic/using-prefix-blogname-do-not-clean-proper-name
• http://wordpress.org/support/topic/whats-new-in-the-update

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EXIF patch is not merged: don't like the $_GLOBAL solution here. Also, it would add prefix to EXIF-supported images too, it will require a fallback and things would get (even more) messy from that point. I'll try to code the EXIF modification as a community filter for uploadplus, but I don't think it will end in the plugin itself.

New filters allow for plugin modifications via theme or plugin:

• uploadplus_prefix
• uploadplus_upload_prefilter
• uploadplus_image_metadata
• uploadplus_attachment_title

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unnecessary redundant options.