Adds -V 'category: ...' to makeflow resource summaries.
Include limits set in the resource summary

The limits set are printed in the summary with the prefix "limits_".
This can be used to record what resources where requested, from which we
can compute an estimate of resources wasted.
Rewrite monitor command until the last moment

Now we keep separate the monitoring command from the original 'vanilla'
command, and rewrite the monitoring command just before the node is
dispatched to the batch interface.  This to allows the modification of
the monitoring command when resources are exceeded.
Read multiple summaries from stream

This allows to read multiple summaries from a single file, as they come
from the resource archive.
Monitor makeflow for all resources (not only disk and memory).