produce better drafts for releases

Introduce Changelog.draft.rst in the releasing process. Using a dedicated file
for the WIP gives more readable diffs.

Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>

Changelog.draft.rst

@@ -0,0 +1,52 @@
+=========
+ChangeLog
+=========
+
+Users should ignore this content: **it is draft**.
+
+Contributors should add entries here in the following section, on top of the
+others.
+
+`WIP (coming releases)`
+=======================
+
+New Features
+------------
+
+* Makefile learn to build the package and make it the default.
+* Introduce a Changelog.
+* Migrate documentation to restructuredtext.
+
+Changes
+-------
+
+* Imply single threading mode in debug mode exept for "-d thread".
+* Code and import cleanups.
+* Allow UI to have arbitrary names.
+* Code refactoring around UI and UIBase.
+* Improve version managment and make it easier.
+
+Bug Fixes
+---------
+
+* Fixes in README.
+* Only verify hostname if we actually use CA cert.
+* Remove uneeded files.
+* Fix makefile clean for files having whitespaces.
+* Fix makefile to not remove unrelated files.
+* Introduce a true single threading mode.
+* Fix 'Ctrl+C' interruptions in threads.
+* Fix ssl ca-cert in the sample configuration file.
+
+Pending for the next major release
+==================================
+
+* UIs get shorter and nicer names. (API changing)
+
+
+Stalled
+=======
+
+* Learn Sqlite support.
+    Stalled: it would need to learn the ability to choose between the current
+    format and SQL to help testing the long term.