command line parsing outsourced to ParseCommandLineOptions(), cases in main() listed in alphabetical order, setting of cell_size by hand replaced through already present SetDimension()
new function ParseCommandLineOptions() does the command line parsing, subsequently some variables weren't needed anymore in main().
sorted the cases in switch in main() of the interactive menu in alphabetical order.
In 't'ranslate and 'c'enter cases, SetDimension() and by-hand setting cell_size was present. The later was thrown out