Private superoverlay support

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Add support for private superoverlays as a general purpose feature and 
implement a sample layer in Oregon MarineMap using possibly an ODFW dataset 
they desire to make available.

Update from Matt Oct. 4th.  Needs to be tested with OMM.

 I implemented a first cut at private superoverlays. I've tested it with the ecotrust fishing data and with several gdal2tiles-generated datasets and it appears to work well.

The basic idea is that you have a single doc.kml which serves as your "base 
kml" .. which can be shared to specified groups just like any other private 
layer. Any file at or below the directory level of this base kml is accessible 
through relative paths.

So if you can access the base kml by:

   http://localhost:8000/layers/overlay/1/0/

Then you can also access all file beneath it, e.g.:

   http://localhost:8000/layers/overlay/1/0/level1/456.png

The full docs are up at
http://documentation.marinemap.org/layers.html#adding-private-superoverlays.
Give it a shot an let me know if you have any questions.

Original issue reported on code.google.com by tim.j.welch@gmail.com on 4 Oct 2010 at 8:36

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Original comment by sfletche@gmail.com on 2 Nov 2010 at 6:35

• Added labels: Milestone-1.2

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tested on OMM on Monday 11-8-10 and everything works like a charm.
closing out this ticket.

Original comment by sfletche@gmail.com on 10 Nov 2010 at 7:26

• Changed state: Fixed