Deleted obsolete files in CoreFiles

closes #14
Added outputpath to getcoupling1|2

Fixes #9
If Drive.inp is available TUNE X and TUNE Y will be read from there.
Renamed a variable and changed indentation of a comment
Inserted a check if sin(dpsi) is negative

Closes #28
Merge branch 'master' of https://github.com/pylhc/Beta-Beat.src