hpcc-systems/HPCC-Platform — pull request #3721 by jakesmith (2012-11-21 18:10:41+00:00)
Title: HPCC-3309 Ensure child graphs are executed sequentially

Thor already executed child graphs in parent graph sequentially,
but they were store in a hash table, and were no longer retrieved
in the order added.

Ensure that they remain ordered.

Signed-off-by: Jake Smith