anchor.diff:  <http://www.lfd.uci.edu/~gohlke/pythonlibs/>
   
   For Windows 64 bit systems, you will need to download the ``wheels`` for
  -[python-igraph](http://www.lfd.uci.edu/~gohlke/pythonlibs/#python-igraph)
  -and [pygraphviz](http://www.lfd.uci.edu/~gohlke/pythonlibs/#pygraphviz):
  +link:http://www.lfd.uci.edu/~gohlke/pythonlibs/#python-igraph[python-igraph]
  +and link:http://www.lfd.uci.edu/~gohlke/pythonlibs/#pygraphviz[pygraphviz]:
   
   - ``python_igraph-0.7.1.post6-cp27-none-win_amd64.whl``
   - ``pygraphviz-1.3.1-cp27-none-win_amd64.whl``
  
positive.code: dependency changes on software behaviour.
  
  The virtual environments were initally described and implemented using
  [Ananconda](https://www.continuum.io/). The new system is being designed as
  microservices implemented in docker containers. If you have docker installed on
  your system it is probably easiest to use the containers as described below.
  
  
negative.code: packer build "installation\build.json"
  ```
  
  To get the aws credentials follow this link:https://docs.aws.amazon.com/IAM/latest/UserGuide/id_credentials_access-keys.html[guide].
  
  #### Docker
  The packer command that creates the AWS instance will run a 
  