fixes #124

[timotheecour]

fixes #124
fixes #126

OLD

@9il please double check this is doing the right thing
Also, should the right thing to do be to make I = sizediff_t in the other iota functions in mir.ndslice.topology?

Slice!(Contiguous, [N], IotaIterator!I)
iota
    (I, size_t N)(size_t[N] lengths, I start)
    if (isIntegral!I || isPointer!I)

Slice!(Contiguous, [N], StrideIterator!(IotaIterator!I))
iota
    (I, size_t N)(size_t[N] lengths, I start, size_t stride)
    if (isIntegral!I || isPointer!I)

so that
iota!ptrdiff_t([kh], shape[0] - kh) would just be equivalent to iota([kh], shape[0] - kh) ?

[9il]

Also, should the right thing to do be to make I = sizediff_t in the other iota functions in mir.ndslice.topology?

Done https://github.com/libmir/mir-algorithm/releases/tag/v0.9.0

[timotheecour]

/cc @9il PTAL

[codecov-io]

Codecov Report

Merging #125 into master will decrease coverage by 1.03%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master    #125      +/-   ##
=========================================
- Coverage   61.54%   60.5%   -1.04%     
=========================================
  Files          24      24              
  Lines        2642    2537     -105     
=========================================
- Hits         1626    1535      -91     
+ Misses       1016    1002      -14