[WOBS-3169] - Author's picture in biography tab & [WOBS-3148] - User ima...

...ge limit

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Usage: go to Manage Users in backend, edit one of the user, in user edit screen there will be "User image (full-size)" button on top. Click it and window with original user image will show up with direct url to that image.

Also go to Manage Authors in backend. Select one of the author, click Biography tab next. Button "User image (full-size)" will be shown near author image. Click it and same windows will pop up like in Edit User screen.
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