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Modifications to autotools to include necessary info for building
the darshan workload API. This API compiles fine, but the mpi replay
test is not linking properly with darshan library.

updates to codes workloads: switched to hash tables in the workload--i/o lang plug-in, removed codes_workload_get_info from i/o lang and darshan workloads as this is no longer needed in the bg/p model

Improve the performance of the darshan i/o workload by converting the
linked list of per-rank contexts to a hash table.

The Bison code breaks in Bison 2.7 or newer.  We don't have any changes
planned for the parser itself in the near term, so this commit adds a
version of the parser generated with Bison 2.5 back to the repo for now.

tested with Bison 2.7.1 and Flex 2.5.35 (Ubuntu 13.10)

still need:
- test program
- shim layer logic (for reverse computation)
- example method