add removal of raw bed file to clean_files
add removal of raw bed file to clean_files

- the raw bed file is very large
- once we have the merged and sorted bed, we don't need the orig bed
- if one wants the raw bed for archival, they can just rerun the pipe

dpastling/cnv_pipeline,dpastling/cnv_pipeline,dpastling/plethora,dpastling/plethora,dpastling/plethora