package/cran: Update loader implementation
Fetch package version release date from the Date/Publication
intrinsic metadata field first then fallback on the Date
one
as some package versions only provide the Date/Publication
one.
Update MANIFEST_FORMAT
in CRANPackageInfo
with new date field
provided by updated CRAN lister to force reprocessing of all
versions for a package in order to fix missing release dates.
Use new ReleaseTargetType
model type.
Depends on swh-lister!541.
Edited by Antoine Lambert