Started restart-plugin system
Move hdf5 restart capability to HDF5Writer
Remove unused SimRestartInit. and add comments
Merge branch 'topic-pluginsRestart' into topic-pluginsRestart2

Conflicts:
	src/picongpu/include/plugins/hdf5/HDF5Writer.hpp
Fix testing code
Fix InitPluginNone
Transfer changes from libsplash splash2xdmf to work with pic2xdmf
Split HDF5Writer into subfiles/classes
Add comments to main
Invert splitgrid
Edit the argument parser help text for no_splitgrid
remove double #define __COHERENTINCOHERENTWEIGHTING__
add note to changelog
Merge pull request #315 from f-schmitt-zih/topic-pluginsRestart2

Topic plugins restart
Merge pull request #318 from c-schumann-zih/topic-Pic2xdmfWithSplitedGrids

Topic pic2xdmf with splited grids
Merge pull request #323 from PrometheusPi/fixFormFactorDefine

remove double form factor define
add Hamming window
add Triplett window function
add Gauss window function

add Gauss window function
fix mistakes Triplett window function
correct parenthesis mistake