Initial commit of VB6 code to perform comparison of binary output files

Related to #16

tests/scripts/vb6_binary_files_compare/nets/Net2.dif

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+Links Flow max diff = 3
+Links Headloss max diff = 4
+Links Quality max diff = 3
+Links Velocity max diff = 6
+Nodes Demand max diff = 3
+Nodes Head max diff = 5
+Nodes Pressure max diff = 3
+Nodes Quality max diff = 100