fix green debug position marker not shown for first line #979
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How to reproduce the problem:
create a new file in the Pyzo editor
enter "1" in the first line
set a breakpoint at the first line
run the script
execution is stopped at the breakpoint in line 1 but the green marker is not shown (this problem occurs only for the first line)
This is an index-off-by-one bug. I fixed that.