As discussed in the previous iteration, testing for prompt-availabilty
has been reworked (patch #2).

This is done with the aid of patch #1, which extracts the opening of
/dev/tty from git_terminal_prompt() into a terminal_open(). Its return
value indicates if a terminal is available for prompting. On systems
with HAVE_DEV_TTY unset, terminal_prompt() falls back to checking the
tty-ness of stdin and stderr (as getpass() uses both).

[PATCH v3 1/2] add interface for /dev/tty interaction
[PATCH v3 2/2] allow recovery from command name typos


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