This was fixed ages ago for the interface case but not for the
command line. The thing here is that currently external engines
are relying on reports system to indicate that error happened
so suppressing reports storage in the background mode prevented
render pipeline from detecting errors happened.
This is all weak and i don't like it, but this is better than
delivering black frames from the farm.
Main scheduler would be created way before `-t` argument would be
parsed, since it was on forth pass! Moved it to first pass of argparse,
that kind of stuff should be initialized asap on startup.
Own error when changing order,
moving experimental features last made some sense,
but causes them to be listed twice.
Reorder and comment to avoid it happening again.
creator.c was getting hard to follow.
- Split off argument and signal handling into own files.
- Move docstrings next to functions (to keep docs grouped with code).
