[WMS Server] Using non-EPSG-format projections

[jmckenna@…]

Best explained with an example:

- wms data to be served is in a projection that is not part of the standard EPSG
lookup file
- wms-server mapfile sets the MAP.PROJECTION, and LAYER.PROJECTION to the following:

   # Map projection
   PROJECTION
     "proj=aea"
     "ellps=GRS80"
     "lat_0=59"
     "lon_0=-132.5"
     "lat_1=61.667"
     "lat_2=68"
     "x_0=500000.0"
     "y_0=500000.0"
     "units=m"
     "no_defs"
   END

- however a GetCapabilities request response gives these errors for the layers:

<!-- WARNING: Mandatory mapfile parameter '(at least one of) MAP.PROJECTION,
LAYER.PROJECTION or wms_srs metadata' was missing in this context. -->

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Assefa and I looked into the code and MapServer is looking for an actual EPSG
code here, so this appears to be a "limitation" of MapServer.