merging add_easy_bf branch into new_sched

src/algo/easy_bf.cpp

src/algo/easy_bf.hpp

src/broker/cloud_broker.cpp

src/broker/cloud_broker.hpp

src/broker/user.cpp

src/broker/user.hpp

src/broker/user_model.cpp

src/broker/user_model.hpp

src/json_workload.cpp

src/schedule.cpp

test/conftest.py

test/expected_log/broker-bpNRJ-2machines-para_homo_jobs.csv

test/expected_log/cocktail_user_model-2machines_jobs.csv

...xpected_log/dicho_intersubmission_time-2machines_jobs.csv

test/expected_log/routine_greedy-2machines_jobs.csv

test/test_broker.py

test/test_zexpected_output.py