Update Spark Job with new WriteGraph; Resolves #211

[ianmilligan1]

This should not be merged until AUT 0.18 is released with the new WriteGraph functionality

GitHub issue(s):

#211

What does this Pull Request do?

This is a relatively straight-forward pull request that changes the syntax in the Spark Job from the older WriteGraphML to the newer WriteGraph.asGraphml. This has the primary effect of turning node IDs for the networks from long hashes to simple numbers.

It also updates the application.yml.example as if users are using a version before 0.18.0 the command won't work.

I figured this should be done on a branch as I wanted to particularly make sure that the ensuing networks work well in Gephi. They appear to do so.

How should this be tested?

I have tested locally but basically we will want to see that (a) the standard suite of derivatives are generated; and (b) the ensuing network files work. The two screenshots show some local testing, showing how the new graphs render well after GraphPass and also work well in Gephi.

Additional Notes:

As noted above, only merge once new AUT is released. This should not require new documentation.

Interested parties

@ruebot @greebie

[codecov-io]

Codecov Report

Merging #212 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master    #212   +/-   ##
======================================
  Coverage    89.4%   89.4%           
======================================
  Files          35      35           
  Lines         623     623           
======================================
  Hits          557     557           
  Misses         66      66

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