Improve runCppLint.sh
Improve runCppLint.sh

Fix problem on Linux which didn't display help message if no parameter was specified
Infer src root dir depending on file location
Add explicit parameter to display help message help, --help and -h

BioDynaMo/biodynamo,BioDynaMo/biodynamo,BioDynaMo/biodynamo,BioDynaMo/biodynamo