More PowerEntry work.

src/engine/wpak/PowersParser.java

@@ -154,7 +154,7 @@ public class PowersParser {
                         powerAction.effect_id = arguments[0];
                         powerAction.minTrains = Integer.parseInt(arguments[1]);
                         powerAction.maxTrains = Integer.parseInt(arguments[2]);
-                        powerAction.duration = Integer.parseInt(arguments[3]);
+                        powerAction.duration = Float.parseFloat(arguments[3]);
                         powerAction.curve = mbEnums.CompoundCurveType.valueOf(arguments[4]);
                         powerAction.stackingCategory = arguments[5];
                         powerAction.stackingPriority = Integer.parseInt(arguments[6]);