Do urldecode before generating checksum.
Do urldecode before generating checksum.

Problem occured when using image with spaces in newsletter-mail.
It seems urldecode once (in Kwf_Media::getChecksum) isn't enough.

nsams/koala-framework,kaufmo/koala-framework,Ben-Ho/koala-framework,yacon/koala-framework,yacon/koala-framework,kaufmo/koala-framework,Ben-Ho/koala-framework,koala-framework/koala-framework,kaufmo/koala-framework,nsams/koala-framework,koala-framework/koala-framework,nsams/koala-framework,Sogl/koala-framework,Sogl/koala-framework,yacon/koala-framework