Load.r :
new file added for the loading of the data corresponding to the selected analysis in the Visualization UI (namely the corresponding combobox)

OpenCytoVisualization.js :
- a new web part, a config for it as well as a new div to render to are added for the Load.r script execution above
- selected analysis is 'cached': data is not reloaded if the same analysis is selected as before (for which the date is present)
- a loading mask, while Load.r loads the data for the session, is created on top of the cbAnalysis comboBox and its parent panel
- for the strFilteredTable store in its 'sql' config 'ORDER BY' clause is removed, remoteSort is set to false and instead local sorting configuration 'sortInfo' is added - this allows for the grid to be sortable (once again)
- a fix affecting the generated plot is added
- once a filtering combo's data source gets loaded and once the combobox is once again expanded, a listener is added to 'validate' the value selection, i.e. check all of the choices (they become unchecked, since the store changed and was reloaded)