Merge branch 'RTSD-265' into 'master'

applications/lofar2/model/pfb_bunton/reconstruct.m

...ications/lofar2/model/pfb_bunton_annotated/Gen_filter12.m

applications/lofar2/model/pfb_bunton_annotated/README.txt

...ns/lofar2/model/pfb_bunton_annotated/polyphase_analysis.m

...lofar2/model/pfb_bunton_annotated/polyphase_synthesis_b.m

applications/lofar2/model/pfb_bunton_annotated/reconstruct.m

applications/lofar2/model/pfb_os/dsp_study_erko.txt

applications/lofar2/model/pfb_os/multirate_mixer.ipynb

...ions/lofar2/model/pfb_os/narrowband_noise_generator.ipynb

applications/lofar2/model/pfb_os/pfb_reconstruction.ipynb

applications/lofar2/model/pfb_os/up_down_sampling.ipynb

applications/lofar2/model/rtdsp/firfilter.py

applications/lofar2/model/rtdsp/multirate.py

applications/lofar2/model/rtdsp/plotting.py

applications/lofar2/model/rtdsp/utilities.py