rework setIntersection
fix documentation for nextPermutation and nextEvenPermutation
Merge pull request #1801 from monarchdodra/setIntersection

rework setIntersection
Merge pull request #1822 from GassaFM/master

fix documentation for nextPermutation and nextEvenPermutation
Fix Issue 6730
Merge pull request #1823 from andralex/6730

Fix Issue 6730
fix more import insufficiency
Merge pull request #1824 from 9rnsr/fix_imports

fix more import insufficiency
fix Issue 11838 - Missing emplace import for std.range.zip?
Remove imports enclising by `version(unittest)`

Instead add local imports more.
Merge pull request #1825 from 9rnsr/fix_imports

[REG2.066a] Issue 11838 - Missing emplace import for std.range.zip?