Copyright-holder and year information is extracted from git log.
git history begins in 2005. So (C) from 1998..2005 is lost. Also some
(C) assignment of commits where the committer didn't use --author.
If the copy c'tor of ProcessorSelection was actually used,
assigning the XMLProcessorSelection
processors = other.processors;
would lead to duplicate free() of the XMLNode*
XMLProcessorSelection would need a dedicated copy c'tor that
duplicates allocates a new XMLNode.
see also #10 at https://www.viva64.com/en/b/0540/
Anyway, the copy c'tor and assignment is never used. This commit makes
this explicit.