cylc graph, cylc gui: prototype subgraphs
cylc graph, cylc gui: option to switch on cycle point subgraphs
update
Merge branch '119.iso8601-cycling' of github.com:cylc/cylc into subgraph-graphing
update for ctime name change
Merge pull request #1046 from benfitzpatrick/subgraph-graphing

cylc graph, cylc gui graph view: add cycle point subgraphs
Bug fix recent change to GUI source.
Merge pull request #1049 from hjoliver/1016.bug-fix

Bug fix recent change to GUI source.
Restructure suite run time log/job/ and work/

Directory structure now looks like:
* `log/job/CYCLE/TASK/{01,02,...,NN}/{job,job.out,job.err,job.status}`
* `work/CYCLE/TASK/`

which should make it easier to archive the log for the whole cycle or to
housekeep all the work files of a given cycle.

`log/job/CYCLE/TASK/NN` is a symbolic link that points to the job log
directory of the latest submit for `TASK.CYCLE`.