Add LatLonBoundingBox for root layer

[perliedman]

Adds a LatLonBoundingBox element to the root layer in the GetCapabilities response for WMS 1.1.1, and an equivalent EX_GeographicBoundingBox element for WMS 1.3.0.

According to the WMS 1.1.1 (section 7.1.4.5.6) specification:

"Every Layer shall have exactly one element that is either stated
explicitly or inherited from a parent Layer."

The 1.3.0 spec contains a similar section (7.2.4.6.6).

We have a customer with a WMS client (DigPro) that is kind of picky and apparently refuses to work correctly if this element is missing.

[springmeyer]

Awesome, thanks for the patch. On first glance it looks incompatible with Mapnik >= 2 due to direct Envelope import. Also would be really great to add some basic tests. /cc @manelclos who may have more guidance on tests.

[perliedman]

I'm pretty sure I'm running mapnik 2 - at least I'm running TileMill on the same machine. Also, importing mapnik2 gives me this message, which I guess means I'm running >2.0 if I understand the situation correctly:

 DeprecationWarning:  mapnik2 module has been deprecated,
        please use 'import mapnik'

Is it better to use Box2D, or what is the preferred alternative to using Envelope the way I'm doing now?

[perliedman]

Regarding tests, is there some documentation on how to run them? I installed nose and had a go at running the current tests, but I didn't find any obvious way to run them without all of them failing because of not finding files, etc.

Just a single command line would be plenty, I guess.

[perliedman]

I've added a test to verify the existence of LatLonBoundingBox (1.1.1) and EX_GeographicBoundingBox (1.3.0) in the root layer.

I also added the file empty.dbf, that seemed to be missing and prevented me from running the old tests without errors, I guess it was forgot when the tests were committed earlier; note that my current commit is just a copy of shape_iso8859-1_col.dbf, which I guess isn't right, but at least the tests passes now.

[springmeyer]

Thanks! I sense @manelclos may not be around right now so I went ahead and merged. Hopefully he can coment on the test issue you found.

[manelclos]

Hi! I can't find the original .dbf file, maybe it never existed. The code and the tests look great, Thanks!

[springmeyer]

Thanks for following up @manelclos