Did a major rewrite of ExtractTiming.java.
   Simplified the way records were selected and chunked for linear models.
   Using Apache Commons Math for linear regression.
Changed the way CDF_Gen.java created and called the ExtractTiming.java object.
Added convertIndex to DataHolder.java to change record index between different time resolutions.

Changed/removed some variables in DataHolder.java that were related to the ExtractTiming.java changes.

Fixed a typo in CDF_Gen.java with CDF file names ("ephm-")