log_file should be able to create dated logs

[Justin Schwartz]

Keeping an entire server log in one file can create problems and is not very organized. log_file should be able to create logs with filename in the format log/server/YYMMDD.log

If the server is open for several days, the log file should be reopened with the current date instead.

[Justin Schwartz]

Addressed: Wiki macro error: Changeset 289a00bc136f not found.