Document in which version new types and functions were added using
".. versionadded:: x.y". Document changes using
".. versionchanged:: x.y."
For new modules, add the versionadded tag in the module top
docstring, not on each type/function.
Add fileutils to documentation. The doc part was forgotten during the
graduation.
Add docstrings to convert versions of versionutils.
I used "git blame" + "git tag --contains=SHA1" to find these version,
and then I checked manually each version.
Change-Id: Ia2f00aa29eb36410a49fc1d350896a569a7737a1
7f57de5bb2