AFTER ignores named jobs that don't generate a cronstamp

If job Y is waiting on job X (```AFTER=X```) but job X (```ID=X```) does not generate a cronstamp (because it's not scheduled via ```FREQ```, but via the "classic" fields), then job Y is never executed.

This is undocumented behaviour (and IMHO counter-intuitive). All jobs named with an ID should probably generate a cronstamp, regardless of the syntax with which they are scheduled.