refactored User class, created logs for one sequence, added possibility to create sequences

still todo:
- calculate throughput
- refactor Group
- reduce complexity
- documentation
- check process for correct usage (still an error)
- create tests
- create preconditions
Merge remote-tracking branch 'origin/last_performance_tests' into local_lps

Conflicts:
	scripts/lps_test_case_definition.py
	scripts/lps_test_run.py
renamed to tests because testcase definition was confusing