Log Message:
Update to 5.7.1

* Move --enable-zsh-mem configure option to non-debug part
  to stabilize zsh with NetBSD's new jemalloc

Changelog:
2019-02-03  dana  <dana@dana.is>

	* unposted: Config/version.mk, Etc/FAQ.yo, README: Update for
	5.7.1

	* 44034: Completion/Unix/Type/_date_formats: Complete %9./%N,
	adjust some wording

	* 44033: Completion/Unix/Command/_dos2unix: Add completion for
	dos2unix/unix2dos

	* 44030: Src/prompt.c, Test/D01prompt.ztst: Return error for
	unrecognised colour name

2019-01-28  Fredric Silberberg  <fred@silberberg.xyz>

	* github #32: Completion/Unix/Command/_git: Fix a typo in the
	git tag completion.

2018-01-27  dana  <dana@dana.is>

	* unposted: Etc/creating-a-release.txt: Document additional
	release steps

	* 44020: Functions/VCS_Info/Backends/VCS_INFO_detect_p4: Fix
	infinite recursion