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Instead of re-computing it dynamically while it's never going to change

The file wasn't added to the removable device

This is not portable, and doesn't work with subfolders, nor with
mountpoints.

As a result, the Media.Duplicate test is obsolete, since a filename
isn't unique in itself. Only the couple (mrl, folder_id) is UNIQUE.
However, UNIQUE doesn't apply when the folder_id foreign key is NULL
Uniqueness has been manually tested for a real folder/mrl couple

Relying on the fact that we only use a specific set of getters is not
future proof at all.
Also, this is using lazy loading instead of a fairly heavy overhead each
time we fetch all the folders

This is needed to instantiate a device in order to get its mountpoint

This will be used to remove the device mountpoint from full length path

This is IDevice's job now

There is no point in exposing directories to the outside world

This doesn't work well with removable devices, and fetching from the
database is quite light

Ease up the modifications of devices & their content.

This also allows us to reintroduce the last modification date changes