i18n: Japanese translation update
resampler-test: Add zero padding.
resampler-test: Add a new quality testing
resampler-test: Change the default rates
resampler-quality-test: Add support for saving as WAV
resampler-quality-test: Add missing break
resampler-quality-test: Add missing long options entry
resampler-quality-test: Be consistent with the sample format
tests: Add python script for FFT analysis
resampler-quality-test: Remove unused variable
reampler-quality-test: Change the default format to s16 temporary
resampler-quality-test: Define the time unit for signal length
resampler-quality-test: Revert sample format to float32
resampler-quality-test: Add SNR measuring capability.

Erik de Castro Lopo
resampler-test: Refactor
resampler-test: Change the default test case to test all methods

This changes the default behaviour of our resampler-test if we
don't provide a resmaple method or sample format on the command line.

If neither a method or a sample format is specified we test all
resampling methods.

This way if we run 'make check' all our resampling methods will be
tested.