# version 1.0.3
# - added comments to code
# version 1.0.2
# - Fixed minor bugs
# version 1.0.1
# - Fixed a bug in ml.est: function pred.y now receives the optional parameter tau
# - Added new options for sel.pairs 
# - Added new function sel.plot
# version 0.9.0
# - some work on vignette
# - Fixed a bug in ml.est: a vector of covariate is now accepted.
# - Improved checks in sel.edit
# - Added 'legend' option for sel.pairs (defaults to TRUE)
# 
# version 0.8.1
# - initial version