Minor updates
Unit test fix
One more option to compare .lab files: treat expected complex chords as
major/minor when possible.
No chord detection was slightly improved, minor update.
Cleanup, minor updates
Better handling of single beat chords
Support for QMUL beat tracker vamp plugin (no vamp host included here).
Log configuration parameters before processing
Log class fix
Calculation of chord segmentation
No more unnecessary addition of fictive last beat
A class to calculate only spectra using given beat files
Undocumented capability to save spectrum and beat were removed because
of introduction of BatchSpectrumCalc. Still there is an undocumented
capability to read beats from corresponding files if they are present in
the scratch dir
Beat files have been adapted to QMUL beattracker style: each line
contains beat time and bar # (fictive in case of BeatRoot). Reader and
writer modifications, unit test.
Use QMUL beat tracker when BeatRoot fails