Copy stable/10@r272459 to releng/10.1 as part of
the 10.1-RELEASE process.

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

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

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

Update the comment to reflect what is actually going on.

Submitted by: mux

Remove dead code.

MFC after: 2 weeks

- Move csup away from contrib/ and into usr.bin/. Software is no longer
contributed, and main development is happening in the FreeBSD repo.

Suggested by: joel

- Add missing data argument to printf.

Submitted by: Pawel Worach <pawel.worach -AT- gmail.com>
MFC after: 1 week

- Add proper error checking and printing to the CVSMode code when reading and
writing from/to streams, as leaving them out stops csup from cleaning up on
SIGINT and friends properly.

MFC after: 1 week

- Remember to set umask before setting attributes of RCS file.

Tested by: dougb
MFC after: 2 days

- Try to handle rcsfile write failures in the same way as cvsup, as they are not
necessarily fatal. If the file was incorrectly written, the checksum will
detect it and the file will be retransferred.

- Fix an issue where file attributes were not installed correctly during a Touch
and SetAttrs operation.
- SetAttrs and Touch were incorrectly switched.

Merge support for CVSMode (aka. mirror mode) into csup. This means csup can now
fetch a complete CVS repository. Support for rsync update of regular files are
also included, but are not yet enabled. The change should not have an impact on
existing csup usage, as little of the existing code has changed.

This commit was generated by cvs2svn to compensate for changes in r156701,
which included commits to RCS files with non-trunk default branches.

Import the latest snapshot of csup (20060313).

Initial import of csup.