Increment Emacs version to 27.0.50

* README:
* configure.ac:
* nt/README.W32:
* src/msdos.c (internal_terminal_init):
* msdos/sed2v2.inp:
* etc/refcards/ru-refcard.tex: Increment Emacs version to 27.0.50.
* etc/NEWS: New file with sections for Emacs 27.1.
* etc/NEWS.26: Renamed from etc/NEWS.

README

@@ -2,7 +2,7 @@ Copyright (C) 2001-2017 Free Software Foundation, Inc.
 See the end of the file for license conditions.
 
 
-This directory tree holds version 26.0.50 of GNU Emacs, the extensible,
+This directory tree holds version 27.0.50 of GNU Emacs, the extensible,
 customizable, self-documenting real-time display editor.
 
 The file INSTALL in this directory says how to build and install GNU

configure.ac

@@ -23,7 +23,7 @@ dnl  along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
 
 AC_PREREQ(2.65)
 dnl Note this is parsed by (at least) make-dist and lisp/cedet/ede/emacs.el.
-AC_INIT(GNU Emacs, 26.0.50, bug-gnu-emacs@gnu.org)
+AC_INIT(GNU Emacs, 27.0.50, bug-gnu-emacs@gnu.org)
 
 dnl Set emacs_config_options to the options of 'configure', quoted for the shell,
 dnl and then quoted again for a C string.  Separate options with spaces.

etc/refcards/ru-refcard.tex

@@ -40,7 +40,7 @@
 \newlength{\ColThreeWidth}
 \setlength{\ColThreeWidth}{25mm}
 
-\newcommand{\versionemacs}[0]{26} % version of Emacs this is for
+\newcommand{\versionemacs}[0]{27} % version of Emacs this is for
 \newcommand{\cyear}[0]{2017}       % copyright year
 
 \newcommand\shortcopyrightnotice[0]{\vskip 1ex plus 2 fill

msdos/sed2v2.inp

@@ -66,7 +66,7 @@
 /^#undef PACKAGE_TARNAME/s/^.*$/#define PACKAGE_TARNAME ""/
 /^#undef PACKAGE_VERSION/s/^.*$/#define PACKAGE_VERSION VERSION/
 /^#undef PENDING_OUTPUT_COUNT/s/^.*$/#define PENDING_OUTPUT_COUNT(FILE) ((FILE)->_ptr - (FILE)->_base)/
-/^#undef VERSION/s/^.*$/#define VERSION "26.0.50"/
+/^#undef VERSION/s/^.*$/#define VERSION "27.0.50"/
 /^#undef SYSTEM_TYPE/s/^.*$/#define SYSTEM_TYPE "ms-dos"/
 /^#undef HAVE_DECL_GETENV/s/^.*$/#define HAVE_DECL_GETENV 1/
 /^#undef SYS_SIGLIST_DECLARED/s/^.*$/#define SYS_SIGLIST_DECLARED 1/

nt/README.W32

 Copyright (C) 2001-2017 Free Software Foundation, Inc.
 See the end of the file for license conditions.
 
-		Emacs version 25.1.50 for MS-Windows
+		Emacs version 27.0.50 for MS-Windows
 
   This README file describes how to set up and run a precompiled
   distribution of the latest version of GNU Emacs for MS-Windows.  You

src/msdos.c

@@ -1791,7 +1791,7 @@ internal_terminal_init (void)
 	}
 
       Vinitial_window_system = Qpc;
-      Vwindow_system_version = make_number (26); /* RE Emacs version */
+      Vwindow_system_version = make_number (27); /* RE Emacs version */
       tty->terminal->type = output_msdos_raw;
 
       /* If Emacs was dumped on DOS/V machine, forget the stale VRAM