[PATCH] CSV imperial import

[Miika Turkia]

These patches allow one to import CSV file in imperial units. It is for the
pre-configured Subsurface style CSV. I am not sure how sensible this is,
but this format allows importing more fields than what we have in the
manual CSV import (and we got a request for this). Thus I thought it might
be useful.

Cylinder size is currently not supported in imperial format as it doesn't
really make sense without working pressure. And that I doubt anyone will
record on paper/excel logs. Of course, we could give rough estimates in the
form of 80 cuft -> 11L, 100 cuft -> 13L (or whatever they happen to
commonly be).

I was wondering if it would make sense to implement exporting the CSV files
in imperial units as well. Opinions?

miika
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