Reduced logging

* Greatly reduced logging output by default (no graph dumps, only stacktraces generated by testing exception handling)
* Standardized logging levels across projects
* Added system properties to control log level globally or for each package:

log.fcrepo
log.fcrepo.auth
log.fcrepo.connector.file
log.fcrepo.generator.dublincore
log.fcrepo.http.api
log.fcrepo.http.commons
log.fcrepo.jms
log.fcrepo.kernel
log.fcrepo.storage.policy
log.fcrepo.transform