Add methods getTask and runTask to JPetTaskRunnerInterface
Add methods getTask and runTask to JPetTaskRunnerInterface

Also remove getSubTask method from JPetTaskIO

kmuzalewska/j-pet-framework,kmuzalewska/j-pet-framework,kmuzalewska/j-pet-framework,kmuzalewska/j-pet-framework,kmuzalewska/j-pet-framework