Self-contained desh (with manifest and tests)

[ivanakcheurov]

A file containing desh should be self-contained thus containing more information than just business rules:

1. Manifest
   • execution engine version,
   • execution engine parameters (e.g. find all decisions or stop on the first found),
   • known variables, perhaps with allowed values (enumerations) or types (e.g. text, integer or decimal point numbers),
   • known operators.
2. Desh: the business rules section.
3. Tests: a bunch of pairs (input object, expected result).