update to fence distances

While in the process of digging through the park data in order to answer a question from a league member, I noticed that the LH/RH HR ratios were being calculated using the overall PA rather than the actual number of PA by LH/RH batters.  Since it was trivial to pull the PA splits from the PBP database I went ahead and corrected this, including the 2009 data since we use weighted 2-year park effects.  For most teams this didn’t result in much of a change, since their LH/RH PAs were already fairly equally distributed between home/away games.  There were a few teams where there was a significant difference (e.g. the Cubs had ~300 more PA by RHB at home than on the road).  The updated fence distances are now up on the wiki.