Due to a typo, the upper iteration uses `updateValueFromBelow` instead of `updateValueFromAbove`
to update the value vector. When the flag for monotonicity enforcement from above is active (default),
all values are thus forced to be above the upper bound, preventing convergence.
Example:
prism functionality/verify/mdps/reach/mdp_simple.nm functionality/verify/mdps/reach/mdp_simple.nm.props -sparse -intervaliter
+ test case
Previously, a transition reward with [] would match the self loop
transition added for fixing deadlocks in the explicit engine.
Fixes#29 and adds test case.
Joachim Klein