Small changes

Extracted path including into __init__.py
Extracted including paths in GetLLM into __init__.py
Extracted path including to __init__ files
Changed getsuper to print output of MadX

instead of subprocess.call I used subprocess.Popen(...)
Used __init__ to include dir paths
Introduced return_code in main and further small changes
Extracted filling of file to an external method

fill_id_tfs_file saves a lot of duplicate code.
Small changes
Additional check if to_check_file exists
Fix in subprocess.Popen in getsuper.py
Fixed path to BetaBeat root
Merge branch 'master' of ssh://github.com/pylhc/Beta-Beat.src into exp