ignore edge region is unreliable

[atsju]

More information comming later.

Testing with DFTFringe 8.4.0 the result of these is sometimes very strange and clearly wrong. Display impact is not always same depending on igram.

[atsju]

List of issues I identified :

min and max value for spinbox should be tied to mirror dimensions.

• outside edge can go -500 to +5; Do we actually want potitive values ?
• inside edge can go -99 to +99; Same, do we actually need negative values ?
• DFDFringe doesn't like when the values are more then mirror radius, it's not user/idiot proof

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I think wf->m_inside uses default constructor somewhere when igram has no center hole. But this leads to wrong center coordinates and bad mask

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outside edge changes shape of wavefront. As far as I understand, this is wrong/unexpected.

[atsju]

also drawn center edge is larger than what is selected in spinbox
(outside edge looks OK)