Add capability to select a troop to group
More logical way to set up viewed troop list
Move troop group list to right instead of top
Clear the troop group list on refresh
Add ability to remove a troop from group
Separate removing troops to own feature
Improve vocabulary : select troop -> add to group
Test for adding several troops
Implement adding troop twice to group
Automatically reset application after scenarios

Changed original key shortcut F5 to just re-read troop information.
Added new shortcut Ctrl-Shift-F5 to do full reset (i.e. also clear the
troop group).
Add test for removing only one troop from group
Test for removing same troop twice