IST software update

Dec 04, 2015 

Code uploaded to offline/users/huangbc/star-ist  and https://github.com/bingchuhuang/star-ist
Slides show the changes is attached:
https://drupal.star.bnl.gov/STAR/system/files/StIstRawHitMaker_20151204.pdf

Nov 18, 2015