pass all tests (with dirty debug code)
change line-line intersection algorithm
pass all tests
maybe determine2() can be replaced with determine()
add AT, VALUE constant
add test_case6
implement Segment.guess()
normalize times in plan by Gauge.set_at
skip removed momentums in plan
pass test_under_min
pass test_over_max
pass test_permanent
fix test_case3 in gaugetest.py
pass test_case6
remove not necessary calc_velocity()s
implement Boundary class
code clean-up
code clean-up
code clean-up
rename: prev_time -> since