ENH: Added `iswt2` function
ENH: Added `iswt2` function

Testing coming...

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