veloview: minor Makefile update
veloview: update dictionary flattening & unflattening
veloview: grfio, fully working read/write

TODO: Update, version browsing, and plotting
veloview: Reorganise GRFIO tests
veloview: typos, and renames
veloview: minor fix in grfio tests
veloview: refactor core.io to add update capability
veloview: new test target
veloview: editing support for grf