Graph Tidy

[oliver-sanders]

These changes partially address #74

Mop up for the CytoscapeJS graph implementation.

Functionality should be unchanged (bas the two points in "Modify"):

• Remove getNodes, getEdges, getJobs data wrappers.
  • Use data straight from the store, don't duplicate locally.
  • Don't define blank attributes by default, handle their absence gracefully later.
• Tidy
  • Remove most inline-ifs.
  • Expand and simplify HTML.
  • Remove unused query parameters.
  • Remove unused attributes.
• Modify
  • Remove suite name from graph (this will be done by the status bar)
  • Use the task name for the node text rather than the task id.

Requirements check-list

• I have read CONTRIBUTING.md and added my name as a Code Contributor.
• Contains logically grouped changes (else tidy your branch by rebase).
• Does not contain off-topic changes (use other PRs for other changes).
• Does not need tests (refactor).
• No change log entry required (why? e.g. invisible to users).
• No documentation update required.