networkclustering: include lifetime and build_year in clustering

[fneum]

closes #376

[codecov]

Codecov Report

Base: 75.62% // Head: 75.62% // No change to project coverage 👍

Coverage data is based on head (0745487) compared to base (a47b990).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #571   +/-   ##
=======================================
  Coverage   75.62%   75.62%           
=======================================
  Files          24       24           
  Lines        6244     6244           
  Branches     1335     1335           
=======================================
  Hits         4722     4722           
  Misses       1240     1240           
  Partials      282      282           

Impacted Files	Coverage Δ
pypsa/networkclustering.py	44.10% <ø> (ø)

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