Since we don't have any convention for how to use @version it's best to
avoid it completely. As for the @author tag, it is considered redundant
nowadays because this information is in the version control system.
Dual-licensing allows us to choose any of the licenses. Since the rest
of the project is licensed under the Apache license it makes sense to
remove LGPL altogether.
`CustomTagImpl.java` and `DurationTest.java` didn't have Apache license
header, but I assume they were supposed to, judging from Robert's email
from 5 Aug 2010 on the Rome dev mailing list: "Well, all those files are
things I moved from my other project. If the license headers weren't
changed, it was simply because of an oversight on my part".
