IPPL tests and Boost timer

Summary

Yesterday, I had to compile OPAL together with a student. He requires the IPPL tests since he will work on P3M. However, missing ${Boost_LIBRARY_DIRS} in the link_directories command of the CMakeLists.txt of IPPL test caused the error of not finding boost_timer.

2 Questions:

• Is boost_timer really required in the target_link_libraries command (e.g. here)?

• @snuverink_j You cleaned up these tests in one of the MRs of #291 (closed). You didn't get this error when compiling, right?

Steps to reproduce

Configure OPAL with: -DENABLE_IPPLTESTS=1

What is the current bug behavior?

Cannot find the boost_timer library since -L ${BOOST_LIBRARY_DIR} is missing when compiling.

What is the expected correct behavior?

It compiles properly.

Possible fixes

@wyssling_t and I fixed it in his fork. The corresponding commit: wyssling_t/src@e7f93454