Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Reencode files from latin1 to UTF-8.

This makes a tiny percentage of entries in calendars ugly for latin1
users, but fixes them for UTF-8 users.

This badly needs a solution involving locale-dependent re-encoding.

Add the -a option to report all matches instead of only the
first of each requested type.

Approved by: joerg, sheldonh (mentor)

Define all paths in pathnames.h

Approved by: joerg, sheldonh (mentor)

Teach whereis(1) about games.

Approved by: joerg, sheldonh (mentor)

Complete rewrite, once again.

This is basically a ``C compilation'' of the former whereis.pl file,
employing the same algorithms, and aiming at being mostly
UI-compatible to the old (legally tainted) 4.3BSD whereis(1). In
comparision, the 4.4BSD-Lite version is just another variant of
which(1) only, where in particular the option to search for source
directories is sorely missing.

While i was at it, i added two more options which i contemplated doing
long since. -x will suppress the run of locate(1) to find sources
that could not be found otherwise, potentially saving a lot of time
(but obviously, risking to not find some sources that are well hidden
in the tree). -q will omit the leading name of the query, so in
particular, you can now do something like:

cd `whereis -qs ls`

I'd explicitly like to thank johan for his review which was quite a
bit more than an average review, including sending me a lot of diffs.

Reviewed by: johan