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This is only a rescan, due to changes in album detection and MRL
encoding

And always use MRL for directories, path for files

The folderMrl is expected to be sanitized, while the entrypoint is user
specified

This fixes invalid duplicate albums in case of a compilation by the same
artist

We were wrongfuly creating multiple albums for compilations that were
properly tagged with an AlbumArtist & a year.
This fixes the detection of compilation so that per-year discrimination
doesn't kick in.

Fix https://trac.videolan.org/vlc/ticket/19585

This will help us adjust the behavior when we can't find the filesystem
representation of a file

This prevents us from pushing the same file multiple times to the task
list, most likely in case we were to fail early during the discovery/parsing process

This is required if a service needs to fetch something from the
database, as we will mostly clear it after flush, causing dangling
reference to be held.

aka: Replace place holder comment by the actual code.

We were trying to re-create a file during each resume, which could only
work if the task got interrupted during the extraction step