Added a test for the double precision normalisation from __call__
Added a test for the double precision normalisation from __call__

drwells/pyFFTW,hgomersall/pyFFTW,simudream/pyFFTW,hgomersall/pyFFTW,hgomersall/pyFFTW,frederikhermans/pyfftw-arm,simudream/pyFFTW,simudream/pyFFTW,drwells/pyFFTW,drwells/pyFFTW,simudream/pyFFTW,frederikhermans/pyfftw-arm,drwells/pyFFTW