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This reverts commit 69985bb1.

This reverts commit 41047061.

class PartBunch

-->

template <class T, unsigned Dim>
class PartBunchBase;

modified:   src/Elements/OpalBeamline.h
modified:   src/Solvers/PoissonSolver.h

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!

fixing restart: can now (again) restart from any step in any H5Part file that was written for/with OPAL; SDDS file and load balance file are rewound to an s-position less or equal as in the H5file

- moving the following classes over from OPAL to CLASSIC
  o OpalField       -> ClassicField
  o OpalRing        -> Ring
  o OpalRingSection -> RingSection
  o LossDataSink
- clean up
- splitting Options into classic and opal options

- 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

fix problem when many sections are glued together

No commit message

- use forward declaration where possible
- remove unused includes