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

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

- calendar uses cpp internally, this diff removes this usage and
substitutes a limited subset cpp processor internally.

PR: src/178463
Approved by: re (gjb)

Handle some expression regressions.
Explicitly use GNU cpp for preprocessing.
Remove explicit debugging code.
Change some variable names to be less confusing.
Improve some comments.
Improve indentation.

PR: 162211
168785
MFC after: 2 weeks

On request of joel@:

- Remove the 3rd clause of the UC Berkeley copyrighted files.
- For the files added copyrighted by me, move the "All rights
reserved" to the next line.

Long awaited update to the calendar system:

- Repeating events which span multiple years (because of -A, -B or
just the three days before the end of the year).

- Support for lunar events (full moon, new moon) and solar events
(equinox and solstice, chinese new year). Because of this, the
options -U (UTC offset) and -l (longitude) are available to
compensate if reality doesn't match the calculated values.

MFC after: 1 month

/usr/libexec/cpp -> /usr/bin/cpp
because of new rename to /usr/libexec/cpp0

Adapt to the new `ccp' now that the traditional-behaving /usr/bin/cpp
script is gone.

PR: 15932
Submitted by: Jos Backus <Jos.Backus@nl.origin-it.com>
Tested by: brian, Manfred Antar <mantar@pacbell.net>

- handle events that move around from year to year, i.e.,
``the last Monday in April'
- handle easter

new options
-f calendarfile
-A days
-B days

Calendar HOME directory ~/.calendar
don't sent mail if ~/.calendar/nomail exist

This commit was generated by cvs2svn to compensate for changes in r1590,
which included commits to RCS files with non-trunk default branches.

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