Reshape for a OneElement

[jishnub]

After this, reshapeing a OneElement returns a OneElement.

julia> A = OneElement(2, (2,2), (2,3))
2×3 OneElement{Int64, 2, Tuple{Int64, Int64}, Tuple{Base.OneTo{Int64}, Base.OneTo{Int64}}}:
 ⋅  ⋅  ⋅
 ⋅  2  ⋅

julia> reshape(A, (1,6))
1×6 OneElement{Int64, 2, Tuple{Int64, Int64}, Tuple{Base.OneTo{Int64}, Base.OneTo{Int64}}}:
 ⋅  ⋅  ⋅  2  ⋅  ⋅

julia> reshape(A, (6,))
6-element OneElement{Int64, 1, Tuple{Int64}, Tuple{Base.OneTo{Int64}}}:
 ⋅
 ⋅
 ⋅
 2
 ⋅
 ⋅

This uses the fact that the linear indices are preserved under a reshape to compute the new Cartesian index of the non-zero value.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.90%. Comparing base (39df7ec) to head (b4a19a7).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #365   +/-   ##
=======================================
  Coverage   99.90%   99.90%           
=======================================
  Files           8        8           
  Lines        1073     1078    +5     
=======================================
+ Hits         1072     1077    +5     
  Misses          1        1           

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