Allowing to specify input files at the command-line

[claczny]

It would be nice to have a way to run VizBin in "non-interactive" mode. That means that the user should be able to set the values of the individual fields (e.g., textfield_file) at the command line (e.g., java -jar -Dtextfield_file=/path/to/file.fasta) and then let the whole thing run through all steps without showing the GUI and without requiring to mouse-click on the "Start"-button to execute the run.

This is particularly useful when wanting to integrate VizBin into a pipeline (e.g., to visualize individual clusters as they are returned from an automated binning algorithm). Of course, then, the user would not immediately want do any polygonal selection or such but rather have the points.txt file saved for later use.

This might be related to #11.