Compiler warnings from unit tests
The new unit tests are triggering quite a few compiler warnings. It is not clear to me why these aren't shown with the regular OPAL compilation. Perhaps different warning flags or some of the templated code is not used / compiled.
All are relatively easy to fix, and by far the most of those are sign comparisons, e.g.:
/OPAL-src/tests/ippl_src/Field/FieldDebug.cpp:42:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for (int d=0; d<Dim3; d++) serialParallelSpec[d] = PARALLEL;
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