Prepare global Environment singleton for PMacc
Edited after review-comments

-modefied Environment.hpp
-removed most of the forward declarations for class Environment
-removed some .tpp files
Write meta attributes (units) to hdf5
Fix meta attr. cell size for 2d sims
Add python script for creating XDMF files

 - create XDMF files for PIC libSplash output files
Use python docstrings for docs
Attach species-related attr to species group
Require splash 1.1.1 in cmake
Remove redundant meta attribute
Enable conversion of PIC XDMF particle data
Add Missing TBG_devices definition
Merge pull request #221 from ax3l/fix-weibelCfg

Add Missing TBG_devices definition
remove shebang from module

The module file should not be executable.
comment smooth -> makeOddNumber()
comment smooth.py:makeOddNumber()
add info on module

add __info__() function
add main part for info
comment smooth.py -> smooth()
add help(smooth)
add return info in smooth.py -> gaussFunction
add help to smooth2D() and adjust raises

add help description to smooth2D() function
add help output to main
adjusted raise Exeptions