clean math::vector and DataSpace

- add toString method for math::vector
- rename math::vector.volume method to productOfComponents
- delete all methods in DataSpace which not return a DataDaspace and are defines in math::Vector
Remove SIMDIM from default param file

- Related to #134 (missing change)
use toString to print DataSpace
Merge pull request #137 from ax3l/fix-componentsDim

Remove SIMDIM from default param file
add changes which were annotated by ax3l
Merge pull request #138 from psychocoderHPC/topic-cleanVector

Refactor Vector/DataSpace implementation
add global ConstVector, clean math::Vector

- add math::Vector which support const definition at compiletime on host and device
- clean math::Vector that implicit type conversion is not allowed
- fix all imlizit casts
- DataSpace inherit now direct from math:Vector<int,DIM>
- add new CONST_VECTOR with size iof a cell (float values) to gridConfig.unitless
change *.h guard to #pragma once
add comments, prepare pull request notes
(De)Allocate dataCollector only on mod (un)load
Enable restart from parallel hdf5 files
Require parallel libSplash in cmake
Change index table for only include part. counts

 - index table only including counts (no offsets) prevents MPI_Allreduce
 - particle offsets are computed when reading the index table
Improve writeField in HDF5Writer
Fix globalSize/Offset in writeField
Remove local domain info for parallel write
Add prefix to write and add log message for load
Fix offsets and particle info table for parallelIO

 - improve description of domain offsets/sizes
 - add scalar position for GPUs
 - rename mpi size and rank in CommunicatorMPI
 - add 5D particles_info table to HDF5 to allow particle restarts
 - fix offsets for writing/reading fields
 - allow virtual slides at restart (re-create last GPU/position configuration)
 - change std::cout to pic log messages
Fix collective read and log message

 - all processes must participate in collective read (even without data)
 - fix log message (wrong param number)
Start enabling parallel libSplash support

 - use ParallelDomainCollector
 - add outgoing param in WriteSpecies