Commit 0c80ad06 broke MacOS X builds
because of this discrepancy. It would be easy to accept both, but I
think it is better to be consistent with gbuild.

Be careful whom you befriend with...

There is a class named EditLine in editeng which clashed with one of
the enum values.

Instead of nesting these, we aggregate them into a single non-nested
registry, which saves lots of CPU at startup, sadly we can only do
that for the new-style XML registries, so we have to sniff files,
nevertheless this is still far faster. The merged xml files also
break the XSimpleRegistry::getURL() method - but it appears not
to get called.