fixed bug in rotate and added feature to remove wrap-around on shear!

[RainerHeintzmann]

.. also a little speed improvement in rotate() by using shear!() for the last two shears.

[RainerHeintzmann]

In my tests, the test regarding fftshift!() failed. This function was removed? I replaced it with FourierTools/_fftshift!().

[roflmaostc]

Yes, fftshift! was removed since it got recently added to AbstractFFTs making our implementation obsolete.

Thanks for fixing the test

[codecov-commenter]

Codecov Report

Merging #22 (7da1cfd) into main (4feb95c) will increase coverage by 0.63%.
The diff coverage is 92.00%.

@@            Coverage Diff             @@
##             main      #22      +/-   ##
==========================================
+ Coverage   95.61%   96.24%   +0.63%     
==========================================
  Files          14       14              
  Lines         729      745      +16     
==========================================
+ Hits          697      717      +20     
+ Misses         32       28       -4     

Impacted Files	Coverage Δ
src/fourier_shear.jl	89.58% <88.88%> (-1.05%)	⬇️
src/fourier_rotate.jl	90.00% <100.00%> (ø)
src/nfft_nd.jl	90.00% <100.00%> (ø)
src/fftshift_alternatives.jl	100.00% <0.00%> (+24.00%)	⬆️

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