Interface to gather errors information

[ac1dloop]

First of all, thanks to authors of this library!

I succeeded in encoding and decoding some data. But when i work with soft decisions decoder it would be really nice to see errors count and maybe info on which bits or bytes are corrupted.
I didnt find any interface functions to work with error buffer and im not event sure if its correct to access errors buffer from convolutional struct after decoding.

Could you please provide any info on how to operate with error buffer at this moment?
Could you add interface functions to work with error buffer?