More adjustments for PPMPF_TST, added assistive macros added (#13).
More ppmpf tests into distinct files, 'make tests' into 'make test' (#13).

    *) Different ppmpf macro functions for ppmpf tuples where split out of
       the single chunk used as a test.
    *) There is not distinct 'make tests' anymore, everything done from now
       on in 'make test'.