tissue saturation in repetitive diving

[Miika Turkia]

There is something wrong currently with the calculation of tissue
saturation. It looks like the earlier dive is getting cumulative saturation
from the later dive. Clearly visible when you open the XML and switch
between the dives. There is also a spike on the start of the earlier dive
as show on screenshot.

This is with the beta release (and master).

I have added a test XML to demonstrate the issue. dives/test20.xml with the
same dive repeated again the next day.

miika
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