Add code sent to me from Babak @ UIUC for generating events from
their I/O trace recorder.

Now, specify the darshan install directory with --with-darshan=/dir/
to build the darshan workload generator and link it with test
applications.

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.

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.

- helpful for address-sanitizer use too

- how do I get this to install?

- simplified configure.ac
- moved code from src/common to src directory
- misc minor fixes