basic gtk window
add toobar to basic window
added empty treeview and canvas to the main window
toggle taglist button added
painted a rectange on the canvas
introduced zoom buttons
draw a line
draw a freehand line
nonworking draft
use viewport
works. there is a little floating point accuracy issue left
delete a line by rightclicking it
zoom in/zoom out works
introduced visual selection of single line
zoom fit
drawing area now fills window
Merge branch 'scrollarea' into ui_gtk_gnome
move selection draft
delete selected items
switched to antialiased mode so selection transparency works