* lukas/docs/xmllint_fixes/OTP-14721:
  ssl/ssh: Remove/ignore unused XML_FILES doc files
  Refactor xmllint check and make it fail on failure
  Add toplevel xmllint make target

Conflicts:
	lib/crypto/doc/src/Makefile

* maint-18:
  Updated OTP version
  Prepare release
  ssh: Unicode encoding fix
  ssh: testcases for space trailing Hello msg
  Remove unused test include file from test suites
  eldap: Repair Makefile
  ssh: Don't remove trailing WS in Hello msg

Conflicts:
	OTP_VERSION
	erts/doc/src/notes.xml
	erts/vsn.mk
	lib/compiler/doc/src/notes.xml
	lib/compiler/vsn.mk
	lib/crypto/test/blowfish_SUITE.erl
	lib/eldap/doc/src/notes.xml
	lib/eldap/vsn.mk
	lib/inets/test/httpd_load.erl
	lib/inets/test/httpd_mod.erl
	lib/inets/test/old_httpd_SUITE.erl
	lib/ssh/doc/src/notes.xml
	lib/ssh/vsn.mk
	lib/stdlib/test/zip_SUITE.erl
	otp_versions.table

This commit also adds a check to see that all files that
are part of an xi:include also have part of XML_FILES
and vice versa. It also fixes any applications where this
was not true.

* lars/doc-cleanup/OTP-14475:
  [edoc] Remove unused module otpsgml_layout.erl
  Remove unused files from the documentation build

* maint-19:
  Updated OTP version
  Update release notes
  Update version numbers

Conflicts:
	OTP_VERSION
	erts/doc/src/notes.xml
	erts/vsn.mk
	lib/compiler/doc/src/notes.xml
	lib/compiler/vsn.mk
	otp_versions.table