Factored out logging code in case we need to replace zlog. Zlog has a
limitation that it may be set up only by configuration file, rather
than by function calls. It also requires that users have write access
to the configuation file (as a lock file, by default), while its
alternative dedicated lock file is not flexible enough to be set up
per-user.
Merge branch 'devel' of github.com:keithj/baton into devel
Removed the log category parameter from the logmsg function because it
was constant in all cases.

Removed zlog dependency and replaced with simple print functions.
Merge pull request #53 from keithj/devel

Removed dependency on Zlog logging library