adding seed shift option to the runbatch
some modifications to the boolean solids handlers
move main directory to example/DD4HEP
add main README
Merge pull request #20 from clementhelsens/addseed

adding seed shift option to the runbatch
Merge pull request #21 from clementhelsens/cleaning

Cleaning
Merge pull request #22 from edfarina/three

some modifications to the boolean solids handlers