Bring dwt2 into agreement with dwtn docstring
Bring dwt2 into agreement with dwtn docstring

The behaviour and variable naming of dwt2 did not match what was
described in the docstring of dwtn. This brings the two into agreement
(renames LH/HL and corrects V/H respective to 'ad' naming scheme).

aaren/pywt,aaren/pywt,grlee77/pywt,rgommers/pywt,eriol/pywt,PyWavelets/pywt,kwohlfahrt/pywt,rgommers/pywt,ThomasA/pywt,michelp/pywt,rgommers/pywt,aaren/pywt,PyWavelets/pywt,rgommers/pywt,michelp/pywt,eriol/pywt,kwohlfahrt/pywt,michelp/pywt,ThomasA/pywt,grlee77/pywt,kwohlfahrt/pywt,ThomasA/pywt,eriol/pywt