Deprecate ndgrid, improve code coverage, use iszero

[JeffFessler]

And some whitespace

[codecov]

Codecov Report

Base: 99.92% // Head: 100.00% // Increases project coverage by +0.07% 🎉

Coverage data is based on head (67114f0) compared to base (b21f33a).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #127      +/-   ##
===========================================
+ Coverage   99.92%   100.00%   +0.07%     
===========================================
  Files          39        38       -1     
  Lines        1372      1370       -2     
===========================================
- Hits         1371      1370       -1     
+ Misses          1         0       -1     

Impacted Files	Coverage Δ
src/algorithm/general/ls-mm.jl	100.00% <ø> (ø)
src/mri/mri_trajectory.jl	100.00% <ø> (ø)
src/algorithm/general/dot-curv.jl	100.00% <100.00%> (ø)
src/algorithm/general/dot-grad.jl	100.00% <100.00%> (ø)
src/algorithm/general/ncg.jl	100.00% <100.00%> (ø)
src/algorithm/general/ogm_ls.jl	100.00% <100.00%> (+1.88%)	⬆️
src/algorithm/general/pogm_restart.jl	100.00% <100.00%> (ø)
src/mri/sensemap-sim.jl	100.00% <100.00%> (ø)
src/utility/max_percent_diff.jl	100.00% <100.00%> (ø)

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