Queue updated in order to be able to have infinite capacity. 0 or a negative integer must be given as input

topology21 developed to test new objects. LineGenerationJSON.py updated to read the JSON input for BatchSiurce and BatchDecomposition. Test updated to include topology21

documentation and examples modified to reflect the ascending priority in the priority scheduling rule

Priority and NextStage scheduling rule changed to work in ascending order (i.e. lowest priority value first). This should be reflected to documentation! In Topology20 input all the priority values p have been changed to -p so that it gives the same result and passes the test