Some changes
--------------

 * diffnet_ex.R, ggmgsa_ex.R: very small changes
 * auxfunc.R: small change in plot.2networks
 * diffnet.r, ggmgsa.R: include argument verbose=TRUE/FALSE
 * nethet.Rnw: include diffnet, ggmgsa examples
Merge branch 'master' of https://github.com/FrankD/NetHet