Improve cfg files and add TBG variable doc

 - simplify .cfg files (only include used variables)
 - create central TBG cfg file and variable documentation
Updated cfg files and improved macro doc

 - added var for periodic
 - added radiation plugin doc
 - fixed typos
Improve header layout and add internal variables
Add note for multi-use flags
move parameter, fix example parameter

- move --periodic to required variables
- change grid sizes and timesteps to reasonable values
add moving window option to lwfa example
Merge pull request #1 from psychocoderHPC/topic-betterCfgs

move parameter, fix example parameter
Rename TBG_analyser to TBG_plugins
Merge pull request #153 from f-schmitt-zih/topic-betterCfgs

Improve cfg files and add TBG variable doc