More correct parent directory module importing

We have Python packages now, so it's now possible to import them in more
elegant way.
Merge remote-tracking branch 'origin/dev' into spidercrab
graph_workers package cleanup
spidercrab_integrity_test.py, get_ocean_root_dir()

spidercrab_integrity_test.py - Testing of availability and
communication of dependent system elements

get_ocean_root_dir() - (don_utils.py) Search for the root
directory location and return it
Improving don_corleone, #142
Merge branch 'spidercrab' of https://github.com/OceanVision/ocean into ocean_don_corleone
Passing tests, #142
Finished don corleone extensions, #142
Update display info
Added missing paths and fixed bug in don corleone
Passing 1000 test, #146
Fix major error
Merge branch 'ocean_don_corleone' into dev

Conflicts:
	scripts/ocean_small_exemplary_data.py