exposurses

See this commit: 8d3e66b5ecffa8bcf7691c3f0600840b934beb1a

I'm such an idiot.

- Remove `set_top_row` when setting the shutter menu to the correct
value. Leaving this in fooled me into thinking I had things working
because I just happened to test on the matching ISO/Aperture values.
Plonker. And then it turns out, there was loads wrong.
- Need to include stdlib.h for `strtod` function, otherwise it uses some
kind of stub function (no complaints in compile or use, but it just
doesn't work).
- Wasn't passing right kind of values to `shutter` anyway! Need to
convert these to numeric
- Need to use `fabs` not `abs` for doubles.
- In `nearest_match` wasn't using the correct arrays, had copied over
`iso_array` and forgotten to change them
- Use `strstr` instead `strchr` as couldn't get the former to work and
was probably the wrong one to be using
- Leave some commented out stuff at the bottom that I've been using for
debugging
- check-in: 68919dca22 user: base@atomicules.co.uk tags: origin/master, trunk