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Now, as the app executes, darshan-core persists the id->name
mapping data to the tmp log file. This is done by serializing the
id->name mapping to the mmap log file region when new records are
registered.

user can now give a config option or use a runtime environment
variable to control darshan's per module memory requirements.

this indicates whether the log file is complete or only partially
written

* header is now raw uncompressed, rather than gzip format
* mapping info stored in header is now in uncompressed terms
* storing mapping info for job data now