Add @combine for more manual reduction

[tkf]

close #114

New API: https://juliafolds.github.io/FLoops.jl/previews/PR117/tutorials/parallel/

• reenable strict
• remove @combine-in-loop f2f4f3c

[codecov]

Codecov Report

Merging #117 (6d9c396) into master (b498a7f) will decrease coverage by 1.62%.
The diff coverage is 87.62%.

@@            Coverage Diff             @@
##           master     #117      +/-   ##
==========================================
- Coverage   94.90%   93.27%   -1.63%     
==========================================
  Files           5        6       +1     
  Lines         706      892     +186     
==========================================
+ Hits          670      832     +162     
- Misses         36       60      +24     

Flag	Coverage Δ
Pkg.test	93.27% <88.02%> (-1.39%)	⬇️
Run.test	87.84% <86.08%> (+0.23%)	⬆️

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Impacted Files	Coverage Δ
src/combine.jl	86.28% <86.28%> (ø)
src/macro.jl	94.11% <100.00%> (+0.24%)	⬆️
src/reduce.jl	94.75% <100.00%> (+0.04%)	⬆️

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