issue with in_degree method

The in_degree method returns wrong values if it is called with the weight
parameter. As far as I could trace down the issue, it seems the method
weighted_in_degree is resposible with C++ signature:
boost::python::api::object weighted_in_degree(graph_tool::PythonVertex
{lvalue},boost::any). Below is a minimal example.

Let's create a simple directed graph with two vertices and one edge.

In [1]:
import graph_tool.all as gt
v1 = g.add_vertex()
v2 = g.add_vertex()
e1 = g.add_edge(v1,v2)

in-degree and out-degree look like expected

In [2]: [[v.in_degree(),v.out_degree()] for v in g.vertices()]

Out[2]: [[0, 1], [1, 0]]

Now, let's add some weight.

In [3]:
g.ep['exposure'] = g.new_edge_property("double")
g.ep['exposure'][e1] = 1.5

the results for out-degree look ok, however the in-degree array looks like
it is shifted

In [4]:
for v in g.vertices()]

Out[4]: [[1.5, 1.5], [0.0, 0.0]]

I am using py27-graph-tool @2.2.36_0+gtk3 and boost
@1.57.0_1+no_single+no_static+python27 I wonder if anyone can reproduce this
issue. in_degree_issue.json

Thanks for noticing this! It is indeed a bug. I have fixed it now in git.

This is rather serious, so I will be making a new release with the fix ASAP.