dies octava gets it's own bookpart
psalter DRYed

path of included psalm/canticle files and label creation now done by commands \zalm and \kantikum
days with special psalms for the Office of Reading, breviary tome I

when preparing the last redaction of the "index of feasts" I didn't consider the possibility
that there are days having special psalms only for this hour while they take the rest e.g. from
some of the Commons of Saints
days with special psalms for the Office of Reading, breviary tome II