new keywords, new init stream, and pulse

3 new keywords are now available at the initialisation stage:
/NO_HEADER, /NO_VLR, /NO_AVLR which will disable the print of the
header, vld and aver respectively.

The inherence of pulsewavestools has been removed and now it’s
pulsewavestools that inherits pulsewaves which make more sense if you
want to have a bare reader and some tools associated to it.

Finally the waveform can now be read with pulsewaves::getWaves()