Fix small bug in capacity calculation
Fix bug: plotting APs with decimation != 1
Fix errors caused by changes in 29cd4f40ef84f68847

Commit 29cd4f40ef84f68847d2713294774e0bfe22901b made changed in
simulate_metis_scenario.py that broke the "METIS Simple Scenario.ipynb"
notebook and thus we are fixing this here.
Improve python3 compatibility: Add some parenthesis

Add parenthesis to some print statements to improve python3
compatibility.