futures TODOs

[robotmasterkris]

• [ ] finish testing roll_on_dte
• [ ] develop and test roll_on_oi
• [ ] develop and test futures simulation
• [ ] fix bug reported by andy - currently don't handle nans
• [ ] performance reporting functions - make backward compatible? or update existing research notebooks (only rp and crypto I think)
• [ ] parallel processing for pairwise correlation calculations