change signature constructObservableValue

allow cancel Job

address merge reguest notes:
https://code.it4i.cz/fiji/haas-java-client/merge_requests/15
https://code.it4i.cz/fiji/haas-java-client/merge_requests/15#note_5610
https://code.it4i.cz/fiji/haas-java-client/merge_requests/15#note_5615
https://code.it4i.cz/fiji/haas-java-client/merge_requests/15#note_5580
https://code.it4i.cz/fiji/haas-java-client/merge_requests/15#note_5582
https://code.it4i.cz/fiji/haas-java-client/merge_requests/15#note_5583
https://code.it4i.cz/fiji/haas-java-client/merge_requests/15#note_5584
https://code.it4i.cz/fiji/haas-java-client/merge_requests/15#note_5585
https://code.it4i.cz/fiji/haas-java-client/merge_requests/15#note_5599
https://code.it4i.cz/fiji/haas-java-client/merge_requests/15#note_5623
https://code.it4i.cz/fiji/haas-java-client/merge_requests/15#note_5644
https://code.it4i.cz/fiji/haas-java-client/merge_requests/15#note_5652
https://code.it4i.cz/fiji/haas-java-client/merge_requests/15#note_5653
https://code.it4i.cz/fiji/haas-java-client/merge_requests/15#note_5655
https://code.it4i.cz/fiji/haas-java-client/merge_requests/15#note_5659
https://code.it4i.cz/fiji/haas-java-client/merge_requests/15#note_5673
https://code.it4i.cz/fiji/haas-java-client/merge_requests/15#note_5674
https://code.it4i.cz/fiji/haas-java-client/merge_requests/15#note_5676
https://code.it4i.cz/fiji/haas-java-client/merge_requests/15#note_5675

https://code.it4i.cz/fiji/haas-java-client.git into iss1051-dataTransfer

Conflicts:
	haas-imagej-client/src/main/java/cz/it4i/fiji/haas/data_transfer/PersistentSynchronizationProcess.java
	haas-spim-benchmark/src/main/java/cz/it4i/fiji/haas_spim_benchmark/core/UpdatableBenchmarkJob.java

Merge request comments:
https://code.it4i.cz/fiji/haas-java-client/merge_requests/14

Merge request comments:
https://code.it4i.cz/fiji/haas-java-client/merge_requests/14

Error occured for same sessionid and jobid.
Solved with a pool of file transfer method