FIX: Set DistributedPluginBase.refidx type correctly

[effigies]

Summary

In 39c4ee3, we had

 def _generate_dependency_list(self, graph): """ Generates a dependency list for a list of graphs. """ self.procs = graph.nodes() - self.depidx = nx.adj_matrix(graph).__array__() - self.refidx = deepcopy(self.depidx>0) - self.refidx.dtype = np.int8 + self.depidx = ssp.lil_matrix(nx.adj_matrix(graph).__array__()) + self.refidx = deepcopy(self.depidx) + self.refidx.astype = np.int self.proc_done = np.zeros(len(self.procs), dtype=bool) self.proc_pending = np.zeros(len(self.procs), dtype=bool)

This looks like a typo, that should have been self.refidx = deepcopy(self.depidx).astype(np.int) or similar.

In this PR, I simply use self.depidx.astype(int). scipy.sparse.lil_matrix.astype copies by default.

Found while removing a deprecated call to np.int.

I also remove a guard for networkx versions that were old in 2012: b908b84

[codecov]

Codecov Report

Merging #3340 (f250f5c) into master (d02750a) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@ Coverage Diff @@ ## master #3340 +/- ## ======================================= Coverage 65.01% 65.01% ======================================= Files 302 302 Lines 40035 40031 -4 Branches 5291 5291 ======================================= - Hits 26029 26027 -2  + Misses 12935 12933 -2  Partials 1071 1071 

Flag	Coverage Δ
unittests	64.79% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
nipype/pipeline/plugins/base.py	58.17% <100.00%> (+0.08%)	⬆️

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[effigies]

Didn't break things. Will merge before a 1.6.1 release, unless I see an objection.