* patch.1: Use higher-level markup that translates better into HTML and other
formats.  (With changes by Andreas Gruenbacher.)

* patch.man: Clarify the description of option --forward.

* src/common.h (follow_symlinks): New variable.
* src/patch.c (longopts): Add new --follow-symlinks option.
(get_some_switches): Recognize the new option.
* src/util.c (stat_file): Follow symlinks if requested.
* patch.man: Document the new option.
* tests/symlinks: Add test case.

* patch.man: The options are mostly listen in alphabetical order; stick to
that.

Failing when trying to patch read-only files causes various users of patch to
break.  Instead, warn by default and introduce a command line option for
choosing a different behavior.
* patch.man: Describe the new behavior and command-line option.
* src/patch.c (read_only_behavior): New variable.
(main): Implement the new behavior.
(longopts): Add the new --read-only option.
(option_help): Describe the new behavior.
(get_some_switches): Recognize the new --read-only option.

* src/patch.c (main): Refuse to patch read-only files, or at least warn
when patching such files with --force or --batch.
* patch.man: Document the changed behavior.
* tests/read-only-files: Split read-only file test case off from
tests/remember-backup-files.
* tests/Makefile.am: Add new test case.

* patch.man: Describe the fixed behavior of --set-time and --set-utc
for timestamps that include time zones.
* NEWS: Update.

* patch.man: Clarify the description of the -N option.

behavior.