export parsed requirement tree to file for downstream consumption

[cs01]

reqtraq parses and validates requirements into a requirements tree that contains all the content, trace info, and metadata.

There are many different ways this data can be used, and naturally other tools may want to consume this data. Some examples are code generation, drawing an interactive graph, a trace report, a report focusing on claims, a wyswig editor, a report focusing on test results, an impact analysis, etc. It also allows use of the data without needing to traverse and parse all source files again.

The output file should be in a widely used format, such as json or some other binary format.