Replace "Show NaN" option with "Show bogus". Bogus values include
infinities, in addition to NaN.
Don't blend the bogus warning color with other warning colors, when
a pixel has both a bogus component, and a shadow/highlight
component. The bogus warning always takes precedence.
Rename "Include alpha" option to "Include alpha component".
Remove "Opaque" option. Warnings are now always opaue, even for
non-opaque pixels.
Add "Include transparent pixels" option, which controls whether
fully-transparent pixels are included in the warning. A fully
transparent pixel is a pixel whose alpha component is less-than or
equal-to zero (note that this doesn't include a NaN alpha
component.)
The labels used in the old display filters ui were more descriptive
than the corresponding property nicks; modify the nicks/blurbs with
similar text.
... Plus random cleanup in clip-warning.
