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Clean up code for processing metadata block.


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  darshan-convert --key X --annotate "key1=val1<tab>key2=val2" <oldlog> <newlog>


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./darshan-convert --obfuscate --key 42 infile outfile
This will hash:
  jobid (if non-zero)
  uid
  exe
  name_suffix


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information that would likely be added after the log was generated. The idea
is that this data should be in key=value\n format.

darshan-convert was updated to put the previous version in the comment field
and darshan-parser is updated to return the previous version field if it
exists.


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- no reading or writing bz2 files yet; probably need to make some function
  pointers or wrappers so that all of the logutils routines that use I/O
  aren't littered with logic to switch compression formats.


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Writes the current log format only. 
Update dashan-convert.c to use the new put interfaces.


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log file and write to another, with optional conversions along the way).  This 
is just a place holder; it doesn't write any data to the output file yet.


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log data)


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- Allows the administrator, at configure time, to specify a list of
  environment variables to check at runtime to find the absolute path to
  place log files in, overriding the normal year/month/day hierarchy
- Falls back to --with-logpath path (if specified) if there is no
  environment variable match
- example: --with-logpath-by-env=FOO,HOME --with-logpath=/log will cause
  darshan to try (in order):
  - $FOO
  - $HOME
  - /log/<year>/<month>/<day>


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the -v output of the input script and produce the same -v output in the
output script.

fixes #33


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greater than the open timestamp. (occurs if file is never closed)
Fix performance calculation so there's no divide by zero.
Fix handling of --total for ACCESS and STRIDE counters.


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generating division by zero when using it. This change casts the
pointers to integers first and then does the subtraction.


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targets.


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  autoconf checks)
- overhaul configure test for MPIO_Request/MPI_Request
- temporarily turn off -Wall



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if a file is opened but not read or written then don't try to calculate
the "lastio" metric for it.


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then don't count the cumulative time for a file when computing the
slowest rank time


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