Separate read and write storage in Jobs in the Director. This
is a major rewrite of some of the low level code and hence has
a high probability of introducing bugs.
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- Move the job init code up to *before* the job is put into
the job queue (resource allocation queue). This permits the
job to establish whether it will read or write or do both.
- Add name() methods to all the resource classes.
- Implement separate read and write storage resource
allocation/deallocation in jobq.c