Use renderchan-job-launcher script as common interface for job rendering.

That allows to add support for different renderfarm engines.
As consequence, Puli is not a hard requirement anymore.
Allow to choose renderfarm engine via commandline
Typo
Don't pass stereo parameter if empty
Add support for Afanasy renderfarm (http://cgru.info/)
Job Launcher: Additional check to avoid task early running
Afanasy: Change block names (should fix dependency tracking)
Fix merging procedure for image sequence
Afanasy capacity tweaks
Fix paths for Manager
Update readme
Return project version with params (fixes blender module)
Allow to set location of CGRU installation via commandline
Allow to explicitly disable gpu rendering

This can be done in two ways:

1. By setting any value to BLENDER_DISABLE_GPU environment variable
This allows to globally for current render instance.
Such option is useful in the following setup: two render instances are running on the same computer. One uses GPU and other utilizes CPU only.

2. By setting disable_cpu=1 in any .conf file.
This allows to explicitly disable GPU rendering for particular file.
Exit properly when Ctrl+C is pressed
Afanasy: Better job/block naming
Sanity check: Don't merge if some segments were not rendered correctly
Fix mechanism for disabling GPU - 6b7fb9a
Lock project when merging segments
Fix sanity check introduced in 8190bf1