Test maskit

[JeffFessler]

Originally intended "just" for code coverage, but it also uncovered a bug, so coverage matters...
(Disabling nightly for now because it is erroring.)

[codecov]

Codecov Report

Merging #66 into master will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #66      +/-   ##
==========================================
+ Coverage   97.76%   97.77%   +0.01%     
==========================================
  Files          48       48              
  Lines        2283     2162     -121     
==========================================
- Hits         2232     2114     -118     
+ Misses         51       48       -3     

Impacted Files	Coverage Δ
src/utility/mask.jl	95.83% <100.00%> (+6.17%)	⬆️
src/io/fld-write.jl	57.62% <0.00%> (-14.51%)	⬇️
src/nufft/dtft.jl	100.00% <0.00%> (ø)
src/nufft/nufft.jl	100.00% <0.00%> (ø)
src/fbp/cuboid_im.jl	100.00% <0.00%> (ø)
src/fbp/rect_sino.jl	100.00% <0.00%> (ø)
src/fbp/image_geom.jl	100.00% <0.00%> (ø)
src/mri/mri_objects.jl	100.00% <0.00%> (ø)
src/fbp/disk-phantom.jl	100.00% <0.00%> (ø)
... and 12 more

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