user should be able to rename/delete shared files if the owner allowed it
fix getMimeType call, we always need to check the source path
add api to get shares from a specific user
generate unique target name
show "shared by ..." for share mount point
don't overwrite shared folder icon
we no longer need to handle the Shared folder different from any other folder
fix share api tests
fix target generation for group shares
fix encryption tests after the removal of the shared folder
fix updating of shared files
fix deleting of shared files