ENH: add complex support to downcoef, upcoef, dwt2, idwt2, dwtn, idwtn
ENH: add complex support to downcoef, upcoef, dwt2, idwt2, dwtn, idwtn

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