* test/lisp/term-tests.el (term-line-wrap-no-auto-margins): add test

* lisp/term.el (term-auto-margins): new variable
(term-mode): documentation
(term-termcap-format): mention auto-margins flag
(term-emulate-terminal): support it
(term-reset-terminal): reset it
(term-handle-ansi-escape): notice it

* etc/e/eterm-color.ti: add auto margin capability

* etc/e/README: fix build documentation

* etc/NEWS: mention auto-margins

* etc/e/eterm-color.ti: Added termcaps for entering and leaving an
alternative sub-buffer.
* lisp/term.el (term-reset-size): Resize correctly in an alternative
sub-buffer is in use.
(term-clear-full-screen-programs): New user option.
(term-handle-ansi-escape):
(term-termcap-format): Handle termcaps for entering and leaving an
alternative sub-buffer.
(term-switch-to-alternate-sub-buffer): New (used to be commented out)
function to enter or leave an alternative sub-buffer.
bug#53485

* etc/e/eterm-color.ti: Add new capabilities
* lisp/term.el: New faces and variables to support new ANSI modes.
(term-termcap-format): Add new capabilities
(term-emulate-terminal): When saving cursor, additionally save the new
variables.
(term--handle-colors-list): Handle ANSI codes, specifying italic other
modes.
* test/lisp/term-tests.el (ansi-test-strings): Adjust tests.

(term-ansi-face-already-done): Make obsolete
(term--maybe-brighten-color): Remove
(term--color-as-hex): New function
(term-handle-colors-array): Make obsolete in favour of the new
function 'term--handle-colors-list'.
(term--handle-colors-list): New function, that can also handle ANSI
codes 38 and 48.
(term-handle-ansi-escape): Use it

* test/lisp/term-tests.el (ansi-test-strings): Add tests for 256-color
and 24bit ANSI colors

These files are plain text and might be used by non-Emacs apps.
They’re mostly ASCII, so just use straight quotes.

terminfo capabilities implemented.

* e/eterm-color.ti (msgr, u6, u7): New capabilities.