Adds a refresh button to the "cylc graph" viewer.

Removes automatic load after modifying the suite.rc file.
Merge pull request #1163 from hjoliver/graph.refresh-button

Adds a refresh button to the "cylc graph" viewer.
Support list of suite to job environment variables

Globally configured list of environment variables that can be passed
from a suite to its jobs.
cylc job-submit: new command

Refactor job submit, poll and kill. Untested change.