SciDAVis - Improvements SVN-temp

- fixed a typo in the German translation
- simplified the way files are loaded
from the command line (and fixed several
bugs by doing that)
- fixed the progress dialog behavior in
ApplicationWindow::openProject()
- extended the handling of command line arguments
(type "qtiplot -h" for info)
- fixed the path where QAssistant is looked for
(it is $PATH or %PATH% now, respectively)
- moved version number/release date constants
into a seperate header file 'globals.h'