View source for Slicer3:Extensions:TODO-2009-06-16

* search vtkSlicerApplication::ModulePaths when consructing the installed extension listings
* warn user if cache path is not writable
* check that ModulePaths disable/enable is not inadvertantly set
* what happens when the Desktop is used as the "module cache path"
* add vtkSlicerApplication::ModulePaths if found downloaded extensions are not there
* "Slicer3-install-bin/../lib/Slicer3/Modules" in ModulesPath
* define all paths
** ModulePaths
** ModuleCachePath
** ExtensionDownloadDirectory
** ???
* ApplicationSettings
** relabel "Module Cache Path" to "Extensions Install Directory"
** use Temporary Directory as the download location for zip files