[mapguide-internals] Patch for ticket 2189: MgLayerCollection::Remove always returns true

[Jackie Ng]

Hi All,

Attached is a patch to fix the incorrect behaviour of
MgLayerCollection::Remove() which currently returns true even if you pass in
a layer that doesn't belong in the collection. Even worse, the method will
then detach that layer's parent and track its change.

http://trac.osgeo.org/mapguide/ticket/2189

Please review. Thanks.

- Jackie



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