The introduction says all the usage examples (e.g. of truncate_stream,
etc) in the section use [0,[1]] as input, but they actually use [1,[2]].
["a",["b"]] seems better than [1,[2]] as the string values won't be
confusable with the indexes in <path>.
Fixes issue with confusion about features that has not been
released yet.
Move deveopment manual.yml to dev/manual.yml
Symlink manual.yml to v1.7/manual.yml
Refactor to share history header with links to other manual versions.
Change man.test and man page generation to use dev/manual.yml
Related to #3078#3127
* Fix typo in documentation for map_values
"map_value(f)" -> "map_values(f)"
* map_value => map_values also in the devolpment manual
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Co-authored-by: Emanuele Torre <torreemanuele6@gmail.com>
