topic material for io

[pearsonca]

• more references to syntax / package docs for python, r read.csv, etc
• packages for particular approaches to reading in data, working w/ big data, etc
• references to discussion about trade offs between different storage formats
• checkpointing discussion
• human readable vs fast / compact discussion
• regex-able inputs / outputs, using regex effectively
• reminder about command line ins / outs, using command line args / arg parse modules