anchor.diff:  To be able to have a easily replicable and deployable 
   environment to run and test the code, we use AWS for 
   provisioning dev machines. A basic dev instance can be setup 
  -using [Packer](https://www.packer.io/intro/), by running the 
  +using https://www.packer.io/intro/[Packer], by running the
   following instructions in the current directory:
   
   ```
  
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: 
  ## Required packages
  
  http://graphviz.org/download/[Graphviz]
  