add liftr_info()

[nanxstats]

liftrInfo() for replacing sessionInfo().

containing:

• Dcoker image info
• Rabix info
• Rabix workflow graph

[davidroberson]

This would be a great feature especially the rabix graph.

[nanxstats]

@davidroberson - thanks for the feedback, this will be implemented. It seems Rabix itself could make this graph, we plan to try this way first. Or, we could also parse the workflow information in R and plot it.

[tengfei]

@davidroberson yes, we will first try to render native rabix graphics, alternatively like Nan said, use basic R graphics to visualize directed graph workflow is also possible.