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Use FWHM 1 as it appears to be much more reliable than 2 or above at detecting stars

Jasem Mutlaq requested to merge (removed):better_fwhm into master

I noticed that the biggest factor in helping to improve solving (beside correct FOV) is the FWHM value. For some capture that never solves, setting FWHM gurantees detection of more stars and 100% of all captures for different cameras were pretty fast.

Same story for SEP in focus. The primary reason it is not selected as default is that Gradient algorithm is still a lot more reliable at star detection. However, setting FWHM to 1 again magically make it work better than gradient. I vote to make this the new default.

@wreissenberger @edejouhanet @murveit Please test this with your own setups.

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