Resolve "Specify trim coil range azimuthally"

Closes #276

See merge request !53

This reverts commit 5fbd4c4b.

Switch 'ENABLE_OPAL_FEL' added to enable OPAL FEL. OPAL FEL requires
MITHRA. MITHRA will be searched for in the usual directories and paths.

Master

See merge request !59

modified:   Algorithms/ParallelCyclotronTracker.cpp
modified:   Algorithms/ParallelCyclotronTracker.h
modified:   Structure/DataSink.cpp
modified:   Structure/DataSink.h
modified:   Structure/MultiBunchDump.cpp
modified:   Structure/MultiBunchDump.h

In case of the sampler/optimiser AMR should not be initialised
by 'main' but inside opal.cpp. However, we need to fix the
AMReX_ParallelDescriptor::StartParallel() function, otherwise
AMR hangs.

modified:   src/Algorithms/ParallelCyclotronTracker.cpp
modified:   src/Classic/Algorithms/PartBins.h
modified:   src/Classic/Algorithms/PartBinsCyc.h
modified:   src/Classic/Algorithms/PartBunchBase.h
modified:   src/Classic/Algorithms/PartBunchBase.hpp

OPAL-Cycl issue #277: Fix deletion bug (we need to delete after the for-loop…

See merge request !58

OPAL-Cycl issue #277: Fix deletion bug (we need to delete after the for-loop otherwise the container is not valid anymore)

Master

See merge request !57