normalize: include standard unit variables
normalize: include standard unit variables

This uses the ReplacementDict.frommodel constructor to get access to
all the standard File unit variables in addition to the special
normalization unit variables. This provides more versatility when
writing normalization and normalization verification commands.

refs #6451

sevein/archivematica,michal-ruzicka/archivematica,artefactual/archivematica,eckardm/archivematica,sevein/archivematica,michal-ruzicka/archivematica,sevein/archivematica,artefactual/archivematica,michal-ruzicka/archivematica,artefactual/archivematica,artefactual/archivematica,eckardm/archivematica,eckardm/archivematica,sevein/archivematica,eckardm/archivematica,michal-ruzicka/archivematica