2.0-9 changes:
- fixed plots in order to pass check (due to new version of ggplot2)

2.0-10:

- main feature - conjoint is now part of the SensMixed package

- added tests for the conjoint function

- for the sensmixed function: changed the options, simplified the arguments (more user friendly). Changed accordingly the manual

- in plot.sensmixed added option for the stacked barplots (sorted bars). (see the manual of how to use it)

- the shiny version SensMixedUI() is changed accordingly



