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Another (very simple) question when there is a bug in my program in the notebook, the computer wrotes me which line the bug is. But I don't how to find this line with the given number. Is there a line-numerator in the notebook?

Hmm, that is harder. At least for simple examples, the line does seem to be the line I made the mistake in:

for i in range(10):
    print i+1
    print i^2
    a=i[0]
    print a+i

But multicell ones don't seem to be as nice. You may just have to look at the code that causes the problem and find it in your input. We don't have interactive markup (e.g. coloring) yet, because the javascript really slows things down.