Sped up mean computation in VectorStats.
Sped up mean computation in VectorStats.

carschno/Mallet,zxsted/Mallet,ohjeyong/mallet,lewg/Mallet,ohjeyong/mallet,RWArunde/Mallet,carschno/Mallet,steveash/Mallet,lewg/Mallet,RWArunde/Mallet,carschno/Mallet,RWArunde/Mallet,ohjeyong/mallet,palm-toolkit/Mallet,palm-toolkit/Mallet,steveash/Mallet,zxsted/Mallet,lewg/Mallet,steveash/Mallet,zxsted/Mallet