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This reverts commit 69985bb1.

ParallelTTracker. Particle-Matter interaction doesn't work either at the moment.

I hope that I didn't create too much of a mess when merging!

OpalData *OPAL = OpalData::getInstance();
OpalData *opal = OpalData::getInstance();

This change applies to following files:

modified:   src/AbstractObjects/BeamSequence.cpp
modified:   src/AbstractObjects/Element.cpp
modified:   src/Main.cpp
modified:   src/Match/MatchParser.cpp
modified:   src/OpalConfigure/Configure.cpp
modified:   src/Solvers/P3MPoissonSolver.cpp
modified:   src/Structure/H5PartWrapperForPS.cpp
modified:   src/Structure/H5PartWrapperForPT.cpp
modified:   src/ValueDefinitions/RealConstant.cpp
modified:   src/ValueDefinitions/StringConstant.cpp
modified:   src/opal.cpp

- remove 'using namespace' from header files
- remove 'using std::string' and 'using std::abs' from header files

For reason see:
o http://stackoverflow.com/questions/5849457/using-namespace-in-c-headers