Fixed NavigationBar bug. 
Must ignore non NavgationBar events.
Fixed NullPwointer.
Changed Active (3rd) Transfer interface(s). 
Instead of VFile the VFileSystem is responsible for ActiveTransfers (3rd
party copying). 
This is the place where most FileSystem implementations actually perform
the 3rd party copying.
Updated to new VFileActiveTransferable Interface. 
VFileSystem now performs the Active (3rd party) File Transfers.
Update TaskWatcher and TaskSource Interface.
Updated 3rd party transfer tests. 
Moved out 3rd party tests to separate integration test.
comments
If the monitor thread is in interrupted state the monitor must check
whether the action task must stop and not print the exception, but exit.
Merge branch 'master' of git@github.com:NLeSC/vbrowser.git

Conflicts:
	source/nl.esciencecenter.ptk/src/nl/esciencecenter/ptk/task/TaskWatcher.java