2012-04-11  Valentin Todorov  <valentin.todorov@chello.at>
    * 0.4-03
    *
    * errors and warnings fixed
    
2011-03-13  Valentin Todorov  <valentin.todorov@chello.at>
    * 0.4-02
    *
    * improved the plot functions for CovNA objects
    *
    * Fixed a problem with PcaNA and method = "cov" - the default
    * method changed to "cov".
    *

2011-03-13  Valentin Todorov  <valentin.todorov@chello.at>
    * 0.4-00
    * Fixed a problem with impMeth="seq"
    * Added function CovNARobust()
    * Added additional plots: which=c(..., "tolEllipse", "pairs", "xydistplot", 	"xyqqchi2")
    *

2010-07-20  Valentin Todorov  <valentin.todorov@chello.at>
    * 0.3-00
    * Added sequential and robust sequential imputation
    * Added all PM-methods: MCD, SDE, OGK, S
    * Adjusted the S4 class hierarhy
    * Some help added
    *
2009-09-25  Valentin Todorov  <valentin.todorov@chello.at>
    * 0.2-01
    *
2009-07-15  Valentin Todorov  <valentin.todorov@chello.at>
    * 0.2-00
    *
    * Prehistory
    *