visualizer: Offset layers at same rank

Layers at the same rank will now be slightly offset. Increased
line width for adjacencies.
Added igraph and plotly packages to extra requirements.

Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks>

1 files changed, 2 insertions, 1 deletions

diff --git a/setup.py b/setup.py
index 6c4fd62..058a26c 100755
--- a/setup.py
+++ b/setup.py
@@ -31,6 +31,7 @@ setuptools.setup(
         'enum34; python_version<"3.0"'
     ],
     extras_require={'NumpyAcceleration': ['numpy'],
-                    'graphs' : ['pydot']},
+                    'graphs': ['pydot'],
+                    'visualizer': ['igraph', 'plotly']},
     scripts=['tools/rumba-access']
 )