Conduit Chains (sandbox)

This is an extension module for Boombatower's 'Conduit' project (a potential successor for qa.d.o, available at https://github.com/boombatower/conduit).

This module adds the ability to create 'job chains' within conduit, and allow the creation of a single 'job chain' conduit job to result in the auto-generation of each job defined in that chain. This module will work in concert with an equivalent 'Worker_chains' module on the job worker, which will control execution of the actual job chain.