Added methods to set injection rate, WPR, GPR and maintain injector/producer status
Updated / added WCONxxx keywords
Loading WPR / GPR / IR from DeckKeywords + setting Prediction / History mode WCONINJX keywords
Merge pull request #50 from joakim-hove/Wells-GPR-WPR-IR

Wells gpr wpr ir
Merge from master, fix conflict (injector introduction)