Drive and test/Drive Modified

Drive was always creating noise file after last commit, this has been
fixed.  The copy of drive in the drive/test/valid folder was rejecting
bpms in BPMstatus function causing its linx and liny files to differ from
the new drives', which rejects no bpms.  This has been fixed also.
Finally, an extra space in the drive/test/valid drive has been removed.
Changes to previous commit, removal of warnings

BPM status function lost a variable in previous commit, this has been
fixed, and the warnings in the compilation of drive have been removed by
replacing -1 with std::string::npos.
Merge branch 'master' of https://github.com/pylhc/Beta-Beat.src into exp