This fixes all warnings about ambiguous module names and resolves #49.

It also highlights that we still need to cut down on superfluous
Require Import commands in recently ported files.

Sergey Bozhko authored 5 years ago and Björn Brandenburg committed 5 years ago

Also removes an unnecessary module in rt.util.epsilon.

simplify structure of behavior, move arrival_sequence and schedule to toplevel, move task and sequential to model