cylc/cylc — pull request #822 by benfitzpatrick (2013-12-18 16:20:46+00:00)
Title: cylc dependency graph: fix handling pre-initial over-bracketing.

This fixes a bug where unnecessarily bracketed clauses cause a crash
when they contain pre-initial cycle references. This is because the
unnecessary brackets in the graph persist through to the data structure
that is fed to the cleanup algorithm. These are now removed.

The new test fails (exit status for `cylc run`) under current master, and succeeds using this fix.