Merge pull request #3 from slarosa/master

minor fixes in ui file
reorganized map tab and add group box to popup dialog
Merge pull request #4 from slarosa/improved_ui

reorganized map tab and add group box to popup dialog
fix groupbox stylesheet for windows os
Merge pull request #5 from slarosa/improved_ui

fix groupbox stylesheet for windows os
Update for README:
changed to markdown text