Fixes Issue 9457 - isSorted(string) does not work.
Merge pull request #1136 from AndrejMitrovic/Fix9457

Issue 9457 - isSorted(string) does not work.
Japanese spell check
Merge pull request #1137 from 9rnsr/spellcheck

[trivial] Japanese spell check
Document std.range.transposed (issue 4330).

Add unittested example as well.
Fix issue 8764

Transposed can only work with ranges of ranges if the subranges are
assignable. Add signature constraints.

Fix forward range bugs (should use .save instead of just copying the
range object).

Add unittests.