866323 - do not print binary files to log

[xsuchy]

if file is binary (e.g pdf file) then do not try to convert it to unicode
and print it to log file
additionally execute this part of code only if logging level is set to DEBUG.

[ozzak]

All unit tests are green :-)

... and for absolute majority of programmers additional shared objects mean
additional fsckup sources.  I don't trust them to write correct async code.
OK, so I don't trust the majority of programmers to find their dicks if
you take their Visual Masturbation Aid++ away, but that's another story -
I'm talking about otherwise clued people, not burger-flippers armed with
Foo For Complete Dummies in 24 Hours.

    - Al Viro about multi-threading on linux-kernel

https://gist.github.com/3891847

[lzap]

Heh that was nasty, ACK