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Refactoring to move aggregations to experimental for the time being. Convieniently reenable by calling darshan.enable_experimental() after import darshan.

fix fscanf redefinitions

See merge request !35

From Francois Trahay

This fix resolves compiler warnings from g++ related to
Darshan module names array.

Have cffi backend cache module index and name_records along with log handle as they are often used internally.

reported by Francois Trahay

1) make sure wtime_offset is set properly when using MPI
2) fix ifdef logic to properly get wtime in all non-MPI cases