20120828
 - Updated weighted mean parallaxes for YPC and Hipparcos known 10 pc
   members whose parallax was also measured by Subasavage et al. 2009, 
   AJ, 137, 4547.
 - Added WD 2110+072 to the list based on a YPC parallax placing it
   within 25 pc and a spectral type of DA (Reid et al. 1995, AJ, 110,
   1838).
 - Removed WD 1214+032 from the list based on a spectral type of dM 
   (Gianninas et al. 2011, ApJ, 743, 138).

20130222
 - Corrected parallax values for WD 0751-252 and WD 0752-676 - the 
   values were swapped.