[MapProxy] Patch for small problem with Dutch national projection

[Anne Blankert]

 Hello list,

I am not sure if this even belongs to MapProxy (maybe a project called
pyproj?) but I found a small projection problem with the Dutch national
projection (EPSG:28992) in my mapproxy configuration:

File mapproxy/lib/python2.6/site-packages/pyproj/data/epsg
Contains a line:
# Amersfoort / RD New
<28992> +proj=sterea +lat_0=52.15616055555555 +lon_0=5.38763888888889
+k=0.9999079 +x_0=155000 +y_0=463000 +ellps=bessel +units=m +no_defs  <>

This should become:
# Amersfoort / RD New
<28992> +proj=sterea +lat_0=52.15616055555555 +lon_0=5.38763888888889
+k=0.9999079 +x_0=155000 +y_0=463000 +ellps=bessel
+towgs84=565.237,50.0087,465.658,-0.406857,0.350733,-1.87035,4.0812
+units=m +no_defs  <>

After a MapProxy server reset, MapProxy will correctly project between
EPSG:28992 (Bessel based) and WGS84 based projections, instead of
displaying a shift of about 75 meters to the north east in most places.

Anne