Squelched massive amounts of debug logging.
Conformed all encoding handling.

Encoding handling now actually does nothing, since fusepy essentially wants text that is either a str (3.x) or basestring (2.x). Our previous handling might have interfered with people's experiences because of this.
readdirs() now yields stats, too.
Trivial change.
Eliminated almost all common logging.

- Translated all info's in volume.py to debug's.
- Translated all string substitution in logging to argument-based substitution.
- We now return stats while yielding from readdir(). Saves fusepy some steps.

Time has shown a considerable improvement.