typographus task: remove all file dependencies

typographus has it's own dependency logic which can only be resolved
when the .tytex input file is processed
preposition connected
use Pslm library instead of pslm.rb executable, don't require psalmpreprocessor.rb
each processed psalm has unique suffix to avoid name clashes

of course I first experienced one :) as the Christmas Day has first and second Vespers,
Magnificat in both :) , and each with antiphon in a different mode requiring different pointing patterns