Added asc2csv.py converter for Magadan .OUT ascii files

Created asc2csv for processing ascii files from .OUT converter. It's the
start of the SAC Ascii file converter which comes next. Damping Ratio
calculator was fixed (offset sign was wrong). Damping ratio sample data
was added, and python notebooks were added. Symmetric Research
DAT2ASC.EXE file also placed in folder as part of the conversion
utilility DAT2CSV.