convolution code refactoring for periodization mode
convolution code refactoring for periodization mode

--HG--
extra : convert_revision : svn%3A993dc4b6-72fc-0310-9b3e-91fa30ebc9a8/pywt/trunk%4069

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