create_instance.sh was killed if it could not finish within 600 seconds, increased this timeout to 1000.

According to the documentation, this should limit the memory requirements of helgrind
from ~3GB to ~1GB per instance.
See http://valgrind.org/docs/manual/hg-manual.html#hg-manual.options

We now have live (to be executed), failed and to be reported queues.
Archive jobs have all three types, retrieve jobs do not have a to be reported
queue. The RootEntry interface interface now provides the choice between the types.
All uses are currently hardcoded to LiveJobs.

The error(s) gets recorded at failure time, and the list is printed at
job deletion time.

This allows helgrind to be aware of succession of events.
Also reduced the default queue depth for unit tests.

Adapted the in-RPM script generation.