Enable running workflows in the web UI

[fsteeg]

• [x] Run workflows via GET, pass data, flux, and fix
• [x] Run workflows with sample data and flux from editor
• [x] Display workflow output
• [x] Set up input fields for data & flux
• [ ] Integrate flux editor (→ new issue)

[fsteeg]

Deployed to test: http://test.lobid.org/fix

[acka47]

+1