As a user of fences
I would like to be able to lock the contents of the portal folders
in order not to accidentally delete its contents
1. the readonly attribute would apply to the entire contents of the folder
2. the attribute would only apply in the portal folder and does not affect the attribute of the actual folder (settings in the portal only affect the portal window and do not affect the files in the folder)
3. settings for readonly mode, can be set globally and individually for each folder portals.
4. the attribute option for read only mode can be set from:
4.1 Portal Option settings
4.2 Window menu for the relevant portal folder
4.3 From the window area of the correct portal folder