Dialog.appVersion added and Dialog.version adapted. Refs: #18.
Dialog.appVersion and Dialog.version set according to System property 'appVersion'.
Dialog.appVersion used for displaying a message in the status bar after start-up of BlackBox.
Docu of module Dialog adapted.

Signed-off-by: Josef Templ <josef.templ@gmail.com>
Merge pull request #6 from BlackBoxCenter/issue-#18

Refs: #18.