* scripts/gitlog-to-changelog: New script. Taken from gnulib.
* scripts/git-log-fix: New file.
* scripts/git-log-footer: New file.
* scripts/git-hooks/commit-msg: New script.
* autogen.sh: Install commit-msg hook for git.
* doc/HACKING: Describe the ChangeLog policy.
* Makefile.am (EXTRA_DIST): Add new files.
(gen-ChangeLog): New.
(dist-hook): Run gen-ChangeLog.
For compatibility reasons a few new files had to be added.
Also added estream-printf as this is now used in app-openpgp.c and provides
a better and generic asprintf implementation than the hack we used for the
W32 code in ttyio.c. Card code is not yet finished.