Make --help-* options available from all command-line tools

Make the standard --help-* options available from all command-line
tools.  Drop options that are no longer supported:

  --copyright, --help-full, --help-html, --help-man,
  --help-compatcommands, --help-custom-modules

De-duplicate Help/manual/*.1.rst help options by using an
OPTIONS_HELP.txt file included from each manual.

1 files changed, 111 insertions, 0 deletions

diff --git a/Help/manual/OPTIONS_HELP.txt b/Help/manual/OPTIONS_HELP.txt
new file mode 100644
index 0000000..baaab0f
--- /dev/null
+++ b/Help/manual/OPTIONS_HELP.txt
@@ -0,0 +1,111 @@
+.. |file| replace:: The help is printed to a named <f>ile if given.
+
+* ``--help,-help,-usage,-h,-H,/?``: Print usage information and exit.
+
+  Usage describes the basic command line interface and its options.
+
+* ``--version,-version,/V [<f>]``: Show program name/version banner and exit.
+
+  If a file is specified, the version is written into it.
+  |file|
+
+* ``--help-manual <man> [<f>]``: Print one help manual and exit.
+
+  The specified manual is printed in a human-readable text format.
+  |file|
+
+* ``--help-manual-list [<f>]``: List help manuals available and exit.
+
+  The list contains all manuals for which help may be obtained by
+  using the ``--help-manual`` option followed by a manual name.
+  |file|
+
+* ``--help-command <cmd> [<f>]``: Print help for one command and exit.
+
+  The :manual:`cmake-commands(7)` manual entry for ``<cmd>`` is
+  printed in a human-readable text format.
+  |file|
+
+* ``--help-command-list [<f>]``: List commands with help available and exit.
+
+  The list contains all commands for which help may be obtained by
+  using the ``--help-command`` option followed by a command name.
+  |file|
+
+* ``--help-commands [<f>]``: Print cmake-commands manual and exit.
+
+  The :manual:`cmake-commands(7)` manual is printed in a
+  human-readable text format.
+  |file|
+
+* ``--help-module <mod> [<f>]``: Print help for one module and exit.
+
+  The :manual:`cmake-modules(7)` manual entry for ``<mod>`` is printed
+  in a human-readable text format.
+  |file|
+
+* ``--help-module-list [<f>]``: List modules with help available and exit.
+
+  The list contains all modules for which help may be obtained by
+  using the ``--help-module`` option followed by a module name.
+  |file|
+
+* ``--help-modules [<f>]``: Print cmake-modules manual and exit.
+
+  The :manual:`cmake-modules(7)` manual is printed in a human-readable
+  text format.
+  |file|
+
+* ``--help-policy <cmp> [<f>]``: Print help for one policy and exit.
+
+  The :manual:`cmake-policies(7)` manual entry for ``<cmp>`` is
+  printed in a human-readable text format.
+  |file|
+
+* ``--help-policy-list [<f>]``: List policies with help available and exit.
+
+  The list contains all policies for which help may be obtained by
+  using the ``--help-policy`` option followed by a policy name.
+  |file|
+
+* ``--help-policies [<f>]``: Print cmake-policies manual and exit.
+
+  The :manual:`cmake-policies(7)` manual is printed in a
+  human-readable text format.
+  |file|
+
+* ``--help-property <prop> [<f>]``: Print help for one property and exit.
+
+  The :manual:`cmake-properties(7)` manual entries for ``<prop>`` are
+  printed in a human-readable text format.
+  |file|
+
+* ``--help-property-list [<f>]``: List properties with help available and exit.
+
+  The list contains all properties for which help may be obtained by
+  using the ``--help-property`` option followed by a property name.
+  |file|
+
+* ``--help-properties [<f>]``: Print cmake-properties manual and exit.
+
+  The :manual:`cmake-properties(7)` manual is printed in a
+  human-readable text format.
+  |file|
+
+* ``--help-variable <var> [<f>]``: Print help for one variable and exit.
+
+  The :manual:`cmake-variables(7)` manual entry for ``<var>`` is
+  printed in a human-readable text format.
+  |file|
+
+* ``--help-variable-list [<f>]``: List variables with help available and exit.
+
+  The list contains all variables for which help may be obtained by
+  using the ``--help-variable`` option followed by a variable name.
+  |file|
+
+* ``--help-variables [<f>]``: Print cmake-variables manual and exit.
+
+  The :manual:`cmake-variables(7)` manual is printed in a
+  human-readable text format.
+  |file|