rewrite entries processed in document order

[Rob Lugt <roblugt@elcel.com>]

I believe there is a slight inconsistency between rewriteSystem and
delegateSystem catalog entries.  With delegateSystem entries the order
within the catalog entry file is not (so) important because entries with the
longest match are processed first.  This is not the case with rewrite
entries, where the first match (in document order) is used.

Of course delegate entries are different in that multiple matching entries
will each contribute their file to the new catalog, whereas there can only
be one successful rewrite entry.  But the concept of matching entries using
the longest possible match first has been introduced, and I wonder why this
wasn't carried forward to rewrite entries.

Regards
~Rob