06-20-2012
-add dependency to igraph to resolve a problem when initiating the PAN class
04-02-2012
-Two functions added to make translation between SNR and p-values
03-20-2012
-Renamed package to PANR because PAN package already exists in CRAN
08-09-2011
-changed the format of figures for the vignette from pdf to png to reduce the size of the package 
01-12-2011
-revised references in help files
