Added tests for building information retrieval methods.
Changes some names in the BBR methods: bdg_base_load_avg_ratio
becomes bdg_min_to_max_ratio
. Adds tests for the BBR methods. Revises the simplify_network method (incomplete).
Changes some names in the BBR methods: bdg_base_load_avg_ratio
becomes bdg_min_to_max_ratio
. Adds tests for the BBR methods. Revises the simplify_network method (incomplete).