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Panning the map in iPhone OS 4.0 causes tiles to freeze up.
Some tiles will move but some will stay frozen. Same happens with zooming.
See TileIssue sample to reproduce this bug
Not sure that it's the same issue as the one show in TileIssue sample. I'll open a new one.
fixes #46: allow animated zoom & zoom/center sets
refs #46: explicitly turn off user tracking when animating zoom/cente…