The closed attribute of the new shape was not copied

Move the copied shape slightly, so that it stands out.

Also change the name of current line/fill color menu entries.

Undo close and Delete shape were partially broken.

This can prove confusing however.

Fix minor bug with zoom level on close/load.

De-activate zoom controls when no image is opened.

If the user is in fit window/width mode, this is retained across
opening/closing of files.

Remove background coloring of label list items as it is confusing.

Also add icon for label files. At the moment it is used for all files.

Mostly working, vertex highlighting needs a bit of tweaking. The code
could use a refactoring as well.

Also change the way vertices are drawn (fill color).

Remove some duplicated code.

This placement should be more intuitive (done closer to entered text).
Revert to previous wording but change from 'Ok' to 'done' to imply
this is not a simple ok/cancel dialog.

Copied from labelme web application : P.

Also switch to round nodes, they seem more appealing.

The user has to explicitly opt out of draw mode now, by toggling the flag.

Fix a few cursor related bugs as well.

Test OpenGL based drawing. Much faster, but lower quality and produced errors
at certain zoom levels, so leave it commented out.

Experimental, not sure it is such a good idea.

Since global colors are stored as well, mark state as dirty when present.

The canvas is now properly updated after a new image is loaded.

Convert some calls to repaint to update for better performance.

Also add a bunch of icons.

User feedback suggests it is confusing, especially if only a single
label is present on the image.

Also the global line/fill color options are kept in the file now as
well.

Conflicts:
	labelme.py

Resolve conflicts and refactor/cleanup a little

Disable listwidget editing altogether.

Warnt the user when he wants to delete a shape
rename view>labels into view?show/hide label panel
rename fill color and line color into Default line color and Default fill color

Connect it to canvas context menu.

Also add some more icons and skeleton for implementing pop-up label
editor for canvas.

This is much more intuitive than the previous functionality.

Also move to consistent naming of shapes as 'Polygons'.