Add support for SSSCC commenting

[Klankers]

Support SSSCC commenting with leading #

This is helpful for adding/removing certain casts, turning them more into a "toggle" rather than an entry (which needs to be remembered between different files).

• Using open (as r or w)
• Pandas
• Numpy? Numpy.genfromtxt()

During ARC01 we'll want to standardize what we use to read any/all CSV files from.

Identified locations of CSV parsing process_ctd.py get_ssscc_list

• ssscc file
• with: open

rinko.py calibrate_oxy

• ssscc group files
• pandas read_csv()

odf_io.py _salt_loader

• salt files
• csv.reader

[asmith75218]

Addressed in PR #100.