search.c: correctly handle escaped backslashes

Addresses PR bin/57106 from Bosco G. G., who supplied the patch.
(This was also committed in the nvi2 sources:
https://github.com/lichray/nvi2/commit/e

search.c: correctly handle escaped backslashes

Addresses PR bin/57106 from Bosco G. G., who supplied the patch.
(This was also committed in the nvi2 sources:
https://github.com/lichray/nvi2/commit/e7054267a371d5caa81edb218f5c8388e11b5197)

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Fix missing of "search wrapped" message when searching from the last char of
file, taken from nvi2:
https://github.com/lichray/nvi2/commit/a59e892d23212559eb1001e5d2a312a02e357651

Fix RCSID's

Apply our local changes.

Import nvi-1.81.6 + HEAD-2013-11-20 from git://repo.or.cz/nvi.git