Add to distributed cache executable flag, directory support
Distributed Cache general purpose copy method, thread safety
Enable additional spargel compiler test
added own instantiate method to CoGroupDescriptorWithSolutionSetFirst; added Test
FS.get(): Add URI causing exception to message.
Allow multiple successive programs on the same execution environment.
Renamed Network Speed test to exclude the long benachmark from regular test cycles
quick and dirty fix for FLINK-927 and added more diagnostics information