Initial commit after using SLF4J Migrator.
Two changes made by hand to preserve the original encoding and minimise the diff.
Fix two-line log factory invocations missed by migrator.
Change argument types to Logger.
Add logback jars.
Update slf4j jars.
Update omero.properties
Remove unused CommonsLoggingAdapter.
Resolve conflict between slf4j.Logger and log4j.Logger
Change fatal() to error().
Force log arguments to Strings.

This can probably be done in a more sophisticated way but to get the
build working this is a reasonable fix.
Fix a few tests missed by the migrator and not picked up in other commits.
Translated log4j-cli.properties to logback-cli.xml