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the POSIX module will call into the Lustre module for each file
record created that corresponds to a file from a Lustre FS. No
counters are currently stored but most of the module strucutre
has been stubbed.

moved most test programs and previous darshan output
to the 2.x directory

this reorganization prevents darshan from being "enabled"
(i.e., accessible to modules) until the initialization
has completely finished.

- prevents inadverdent disabling of Darshan on some MPICH builds
- fixes #94