Blender 2.78c is shipped with a version of the io_blend_utils module that
doesn't have a `pythonpath()` function yet, and that's bundled with an
older version of BAM. To work around this, we ship BAM as wheel, and detect
whether this version is needed to run.
As an added bonus, Blender 2.78c can now also use the file exclude filter
for Flamenco. The `bam_supports_exclude_option()` function is thus no
longer necessary.
A filter like "*.abc;*.mkv;*.mov" can be used to prevent certain files
from being copied to the job storage directory. Requires a Blender that is
bundled with BAM 1.1.7 or newer.
