use the share table from the db to find the item source if the public
link re-shares a already shared file.

http://owncloud.org/dev/coding-style-guide/

calling OC_Filesystem at this point will initialize file system with wrong user (for public shared links if another user is logged in). Therefore remove trailing slashes without the help of OC_Filesystem.

@MTGap Can you please check if this break something?

Fix password authentication for links and fix template problems for links by creating a new base layout