Make sure progress bar label is visible by making the minimum width to 20%.

Fixes #853.
Improve exception for nonexistent local files
Simplified exception stack traces when file is not found.
Exception added to open() and fixed \r\n
The DelimitedInputFormat.open() method did not check if it has parsers
registered. Added throwing an exception when no parser is registered
when calling open. CsvInputFormat does now accept windows line endings
with standards settings. The |\r\n" will be replaced by "\n_"( _ is a
space)... To prevent from errors the returned length is set to the
space. So that this byte is known as parsed and will not get interpreted
anymore.
Functions can now implement ResultTypeQueryable to supply TypeInformation manually.
Extend Delta iteration parameters
Rework Spargel
Add Broadcast variabel support to spargel
Add translation tests for delta iterations
Add translation tests for spargel
Add spargel compiler test.
Fix restrictions with branches in broadcast variables and iteration closures
Replaced old RPC Client/Server with Akka.io Actors. Still buggy
Replaced old RPC Client/Server with Akka.io Actors. Still buggy
Merge remote-tracking branch 'upstream/master'