bug in menu, readline

[Martyn Plummer]

Neither do_menu nor do_readln (in src/main/scan.c) call the function
InitConsoleGetchar. They need to do this to reset ConsolePrompt.  If you
use "scan" to read in data from the terminal, then ConsolePrompt is set
to "n:" for some integer n and this prompt makes an unwelcome appearance
when you use the "menu" or "readline" functions.

Incidentally, could we have a "title" argument and a dummy "graphics"
argument for menu? This if for S-PLUS compatibility, if I may dare to
raise the topic.

Martyn
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