* bugfix in `cost.styl_rhy_file`: now working for stereo files
0.3.1
* `pho` featset now also usable for augmentation with `unit=file` (so far the combination of `unit=file` and `wgt:pho=1` lead to an non-infomative error)
0.2.2
* bugfix `coex.export_rhy`: now working for stereo files
0.2.1
* bugfix in `cost.styl_gnl_file`: accent batch augmentation in stereo files fixed