Instead of the current print to stderr. This way it's treated the same
as other warnings: it has a position, colors, can be made an error,
disabled, goes in the expected formatter, is documented.
Run 'make lintapidiff' in the root of a git checkout to get a list of
potentially missing or wrong @since annotations.
The tool is not built by default, you have to first run 'make
world.opt', and then run 'make lintapidiff'.
lintapidiff doesn't support stop comments: add explicit list of changes to ignore.
see copyright header for license.