Re-sync osmosis-osm-binary with upstream

Fix published POM to specify a LGPL v3 licence
Fix copying.txt based on recent licence changes

The recently added osmosis-osm-binary project is LGPL v3 and not public
domain, so this is explicitly mentioned.  The repo directory no longer
exists in the distribution so any mention of this has been removed.
Fix read empty tasks to have non-conflicting short names

The --read-empty task had a short name of --re which conflicts with the
--report-entity task.  --report-entity has existed for longer so it
wins.  The new --read-empty short name is --rem, and to be consistent
I've updated --read-empty-change to have a short name of --remc.