Import new recordings (media files) to emuDB and create bundles.
Looks for files with the defined mediafile extension of the emuDB
(see mediaFileExtension in vignette emuDB) in dir
or in sub-directories thereof (interpreted as sessions), for each mediafile
create a bundle directory
named as the basename of the mediafile in the specified session, and copies
the mediafile into the bundle. If not already present, adds 'OSCI' and
'SPEC' perspectives to the emuDB config file.