* Retire changelog entries mechanism
It is no longer used these days, so it simply imposes unnecessary
work. If it ever becomes useful again, retrieving the relevant
scripts from history should be relatively easy.
* Remove references to `unreleased.sh`
* Re-add `unreleased.sh` for summarization -- feedback from @mziolekda`
* Move unreleased user-facing features to its own file
docs/source/support/release-notes.rst unfortunately represents a "global
lock" when it comes to submitting contributions: if another contribution
changed it while another was going through the CI/review process, the
latter would have to go again through the CI build after resolving the
conflict and merging the resulting commit.
The contributors originally tried to address this problem by letting the
system automatically performing this operation, but this failed because
release notes were moved to the wrong section by mistake.
This simple change would allow the contributors to let the system take
care of merging on its own, because existing release notes will no
longer be corrupted by the process.
There is a caveat: the automatic merging could result in invalid RST
(mostly because of missing newlines). This would push the task of
ensuring the release notes are valid RST to the release. I would argue
this can be done quite easily and that this is checked automatically
when rendering RST to HTML, so it could be a nuisance during release but
it would make the day-to-day contributions easier.
* Address https://github.com/digital-asset/daml/pull/1762#issuecomment-503540993
* Address https://github.com/digital-asset/daml/pull/1762#pullrequestreview-251676158
* Address https://github.com/digital-asset/daml/pull/1762#discussion_r295279530
* Remove HEAD section from release-notes.rst
* Address https://github.com/digital-asset/daml/pull/1762#pullrequestreview-251678791
* Address https://github.com/digital-asset/daml/pull/1762#issuecomment-503549896
