Rework bs/bc handling and port to AIX #97
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Xvi's interpretation of what capability "bs" and "bc" was wrong because "bs" means that ^H will backspace, while "bc" is only valid if !bs Also, we initialise termcap's external variables PC, BS and UP and ospeed, as per the manual (and AIX's curses.h does not have these.) Also, we rename xvi's internal variables ND and DO to nd and down, the same way as we renamed BC to bc, to distinguish these single-character variables from termcap's, which are strings.
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Xvi's interpretation of what capability "bs" and "bc" was wrong because
"bs" means that ^H will backspace, while "bc" is only valid if !bs
Also, we initialise termcap's external variables PC, BS and UP and ospeed,
as per the manual (and AIX's curses.h does not have these.)
Also, we rename xvi's internal variables ND and DO to nd and down,
the same way as we renamed BC to bc, to distinguish these single-character
variables from termcap's, which are strings.