pilomarfits.py .jpg images don't apply analoggain

[Short-bus]

src/pilomarfits.py captures the raw bayer data directly from the sensor and saves it in .fits format.
It also 'debayers' the data and saves it as a .jpg file so that you can see what was captured.
The current 'debayer' solution does not apply analoggain to the .jpg data, so the resulting file is very dark.
When using raspistill or libcamera-still the analoggain is usually set to 16.0 which produces brighter images.
pilomarfits.py needs to apply the --analoggain parameter to the debayered image before saving.
In the parameter file the templates can then be edited to add '--analoggain 16.0' to each pilomarfits command.