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Existing checkstyle configuration is too restrictive. Changed to that of CS2103T, which would be more familiar to maintainers and collaborators. Also, modified the configuration to ignore a few conventions.
Package Name. Ideally, package names should be in lowercase, but existing package names are in camelCase. Since there are many existing camelCase-d package names, and it does not cause name-space issues, I removed it.
Misc Conventions. I removed the need to group overloaded methods together.
Notes:
For data classes like Nodes etc, fields should still be private, with public getters/setters.
For class names, must be in PascalCase e.g. DepthFirstSearch and not camelCase depthFirstSearch.