Part 1 of delta parsing bringup

Changed name of "chleb" variable to "queue". Fixed lowercase bug.
Improved error messages. Fixed interaction with client_new after code
cleanup. Let's see, if it would get all the files and don't crash.
Part 2 of delta parsing bringup

Encoding path to utf-8 when printing. Makes lots of mess in console
output (only there), but at least it isn't crashing with non-standard
characters.  Added some code to check if file is already there to "get"
command. I'd be comparing date and stuff later, just added it to speed
up a bit my tests of delta parsing code. Temporary stuff.
Part 3 of delta parsing bringup

Fixes removing file/path when files get removed from Dropbox. Fixes some
crashes. I was almost able to download all the files from Dropbox this
time without crash :D Only 71 files were missing, out of 1898 ^^ Apart
from that, delta works :)