add extension model instructions for tiger geocoder install.  add xml entity for download link

git-svn-id: http://svn.osgeo.org/postgis/trunk@10975 b70326c6-7e19-0410-871a-916f4a2858ee
get rid of unbalanced para tag

git-svn-id: http://svn.osgeo.org/postgis/trunk@10976 b70326c6-7e19-0410-871a-916f4a2858ee
get rid of program listing stuff try to fix regress.

git-svn-id: http://svn.osgeo.org/postgis/trunk@10977 b70326c6-7e19-0410-871a-916f4a2858ee
move note into para

git-svn-id: http://svn.osgeo.org/postgis/trunk@10978 b70326c6-7e19-0410-871a-916f4a2858ee