FIX: Retrieve orphaned jobs as list of ints instead of list of tuples
(cherry picked from commit b0d96bc60e02045674e2dafeb7c902d2be91ff70)
HACK: Add datetime to the OptimizerExecutor because eval might require it
(cherry picked from commit 2318ccea8f3b85bf04094e729b3671ba249f50d3)
Merge pull request #1155 from acasajus/fix-r6

Fix r6 (optimizers related things for LHCb)