Moved snapshot statstics into job package

The job package should prodce a snapshot file of a predefined format. How it
does this is not relevant to any other code. Therefore statistics generation
should be encapsulated in the job package.
Don't try to export symbols from a main package

Job package prefactoring continues.
Use String() instead of custom string function

Simplifies the bandit interface and makes it easier to introspect.
Rename bandit to stragey

Better reflects what it does
Documentation fix

Format json.