Investors with a lot of money to spend have taken a bullish stance on Olin (NYSE:OLN).And retail traders should know.We noticed this today when the positions showed up on publicly available options history that we track here at Benzinga.Whether these are institutions or just wealthy individuals, we don't know. But when something this big happens with OLN, it often means somebody knows something is about to happen.Today, Benzinga's options scanner spotted 30 options trades for Olin.This isn't normal.The over ...