and remove some ^M while at it

For example this can happen if the sync client is used before the user created the root directory (e.g. through web login).

Refactor again so we can tell what item is being reshared in case the same source shows up. This is the end of the share_api branch, moving to master.

Large refactoring to allow for the same item to be shared to a group and again with a user in the group with different permissions