ENH: support integer axes in wavedecn/waverecn
ENH: support integer axes in wavedecn/waverecn

also consistently return ValueError on out-of-range axes

michelp/pywt,PyWavelets/pywt,eriol/pywt,rgommers/pywt,PyWavelets/pywt,grlee77/pywt,michelp/pywt,rgommers/pywt,grlee77/pywt,michelp/pywt,rgommers/pywt,eriol/pywt,eriol/pywt,rgommers/pywt