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Fix gnuplot issue

Manolis Surligas requested to merge gh-8e172a8e/87/surligas/waterfall_fix into master

In some cases (crash, inproper termination) a flowgraph failed to produce a binary file that had exactly the proper number of float numbers in order the gnuplot script to be able to convert it in a matrix representation.

The updated script tries to truncate the binary file in such a way so it can be converted into a matrix. This will allow waterfall images to be created even after a crash.

System should have the "truncate" command line utility installed which is part of GNU GNU coreutils.

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