correct bug #3

ltfatpy/gabor/plotdgtreal.py

ltfatpy/gabor/s0norm.py

ltfatpy/gabor/sgram.py

ltfatpy/gabor/tfplot.py

ltfatpy/signals/greasy.py

ltfatpy/signals/gspi.py

ltfatpy/signals/linus.py

ltfatpy/sigproc/fir2long.py

ltfatpy/sigproc/firkaiser.py

ltfatpy/sigproc/firwin.py

ltfatpy/sigproc/groupthresh.py

ltfatpy/sigproc/largestn.py

ltfatpy/sigproc/largestr.py

ltfatpy/sigproc/long2fir.py

ltfatpy/sigproc/normalize.py

ltfatpy/sigproc/rms.py

ltfatpy/sigproc/thresh.py

ltfatpy/tests/comp/test_assert_sigreshape_post.py

ltfatpy/tests/comp/test_assert_sigreshape_pre.py

ltfatpy/tests/comp/test_comp_dct.py