GitLab

These changes add serial port access.
(term-update-mode-line): Modify.
(serial-port-is-file-p, serial-nice-speed-history)
(serial-no-speed, serial-mode-line-speed-menu)
(serial-mode-line-config-menu): New variables and constants.
(serial-name-history, serial-speed-history)
(serial-supported-or-barf, serial-read-name, serial-read-speed)
(serial-term, serial-speed, serial-mode-line-speed-menu-1)
(serial-mode-line-speed-menu, serial-update-speed-menu)
(serial-mode-line-config-menu-1, serial-mode-line-config-menu)
(serial-update-config-menu): New functions.