Ticket #2 (new enhancement)

Description

PyBeast

1. Initialize mutation set from grammar

Call method: python call

Event flow:

1. The grammar is read in
2. For each grammar definition statement read, the following is done:
   1. All possible grammar-correct substitutions, are generated and added to the mutation list
3. Mutation list entries are made unique
4. Mutations are generated as a python source code and output to the standard output with all weights made equal.

Timings: on referenece hardware the mutation set for the python grammar should be generated in less than 10 minutes. Desired time - less that a minute.

Tests:

1. Parse expr grammar and generate the proper mutation set.