Topology definition from file.

[KDahlgren]

If the user does not provide a node list at the command line (e.g. "--nodes a,b,c"), then dedalusParser.py will create a node topology iff an input file contains a list of facts name as "node" (e.g. "node("a","b")@1"). Otherwise, the code does not create a topology.

Solution options:
Soln1. Ensure the input files describe a topology of nodes. Abort otherwise.
Soln2. Make the topology definition facts more robust. For example, use an invariant such as, topology definition facts are (1) binary relations, (2) both attributes are filled with specific strings encapsulated by double quotes, and (3) specify a time.