* Deleting forgotten comment.
* Added the option legendVisible to visual roles. This allows hiding the legend group of only a particular plot and axis.
* Fixed the code calculating the default value of the Transform option of ColorAxis. It would not work as intended when more than two plots exist the color axis (as is now possible).
* Changed the default of ColorAxis for external plots to always be 1.
* Some more improvements to the logged tables.
* Deferes access to option "Trend" of plots till _initPlotTrend, so that local plot options can specify the Trend and TrendType options
* Fixed dangling "name" var, that was resolving to window.name, instead of plot.name...
* Changed the Plot's fields and methods related to visualRoles, so that they are similar to those already in the Chart and Panel classes.
* Fixed precedence of local vs top-level plot options for when the name prefix is used top-level.