TST: convert multilevel doctests to nose format.
TST: convert multilevel doctests to nose format.

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