handle duplicate dataflows #100
Merged
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Some models might have multiple Dataflows between same source and sink that have all same properties (except name and note). They may be required if using the sequence diagram to make it complete but drawing them on the DFD makes it less readable.
This MR adds a new property called TM.onDuplicates with three possible values. By default, no action is taken. When set to RESTRICT, an exception is raised when such dataflows are found. This is meant for models not using the sequence diagram. When set to IGNORE, duplicates are allowed but are not drawn on DFD, only on the sequence diagram.
This is same as #99, there was some issue with merging it because I was rebasing the feature branch.