When SamplingMode==_TEMP_DISABLED_SAMPLING_MODE_ the memory beffers
to accumulate the particle sample are still allocated because sampling
is only temporarely suppressed not completly desabled => sampling can be
executed during the run => memory need to be allocated
The mode _DISABLED_SAMPLING_MODE_ means that the sampling is completely
disables. Allocation of the memory to store sample is limited to the
very minimum

2. Added flag PIC::ParticleWeightTimeStep::GlobalTimeStepInitialized
which is set true when the value of
PIC::ParticleWeightTimeStep::GlobalTimeStep is initialied in
PIC::Init_BeforeParser() or in amps_param__interface.cpp. The flag is
needed to prevent re-initialization of
PIC::ParticleWeightTimeStep::GlobalTimeStep() when it is already
initialized in amps_param__interface.cpp

3. Command "#TIMESTEPPING" is added in the PT component section of the
PARAM.in when AMPS is executed as a component of the SWMF