Fix template rendering error
Merge
Added tag 1.0b3 for changeset 8a98492f0d85
Set stacklevel on DeprecationWarning for more relevant locality.
Updated changelog to highlight backward-incompatible changes
Updated changelog once more to provide a re-assuring narrative about the backward-incompatible changes.
Changed the launcher relevant environment variable to SETUPTOOLS_LAUNCHER and it now accepts different strings 'natural' and 'executable', instead of only reflecting a boolean value.
Reorganized the documentation to cover the different launcher techniques.