Allow sgc to be launched from within a suite sub-dir.
Merge remote branch 'upstream/master' into sgc-subdir-launch
Whitespace correction.
Removed redundant variable.
rose date -c: trap undef ROSE_TASK_CYCLE_TIME.
Tweaked logic.
Merge pull request #633 from arjclark/sgc-subdir-launch

#626: support launching rose sgc from suite sub-directory
Update CHANGES.md
Merge pull request #639 from matthewrmshin/637.rose-date-c

rose date -c: trap undef ROSE_TASK_CYCLE_TIME. Closes #637