Fix output to match splash master interface

- add new global size/offset attributes
- refactor getDimSize -> getScalarSize
- id (aka timestep) has to be int32_t not uint in splash interface
- remove some EOL whitespaces
Add missing #pragma once in libPMacc
Merge pull request #80 from ax3l/fix/splashGetDim

Fix output to match splash master interface
fix cmake file

- fix that source code was not shown in ptx code
- fix that nvcc flags were mixed up
Merge pull request #81 from f-schmitt-zih/pragma

Add missing #pragma once in libPMacc
Merge pull request #82 from psychocoderHPC/fix/cmakeNVCCFlags

fix cmake file: ptx code