Added a new feature in AutoSongSegmentLabel so that it will not
calculate fundamental frequency of syllables too. It uses the "YIN"
algorithm. The code for the "YIN" algorithm was obtained from
http://audition.ens.fr/adc.sw/yin.zip and the original paper can be
found at http://audition.ens.fr/adc/pdf/2002_JASA_YIN.pdf.
I've also added a GUI so that the boundaries can be chosen for syllables
for averaging FF. You can look at the syllables and choose the
boundaries for averaging FF based on portions of the syllable, where the
FF estimate is correct.