update URLs

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@38815 15284696-431f-4ddb-bdfa-cd5b030d7da7

lib/gis/datum.table

@@ -77,7 +77,7 @@ por73    "Datum_73"          international dx=99999    dy=99999    dz=99999
 hjors55  "Hjorsey_1955"         international dx=-73      dy=46       dz=-86
 lis37    "Lisbon_1937"    international dx=99999    dy=99999    dz=99999
 ngo48    "NGO_1948"	  modif_bessel  dx=99999    dy=99999    dz=99999
-# http://www.linz.govt.nz/rcs/linz/pub/web/root/core/SurveySystem/GeodeticInfo/GeodeticDatums/nzgd49tonzgd2000/index.jsp
+# http://www.linz.govt.nz/geodetic/conversion-coordinates/geodetic-datum-conversion/nzgd1949-nzgd2000/three-and-seven-parameter/
 nzgd49   "New_Zealand_Geodetic_Datum_1949"       international dx=54.4  dy=-20.1  dz=183.1
 nzgd2k   "New_Zealand_Geodetic_Datum_2000"       grs80    dx=0   dy=0    dz=0
 # http://earth-info.nga.mil/GandG/coordsys/onlinedatum/CountrySouthAmericanTable.html (accuracy +/-5m), also: EPSG SQL DB V6.4/V6.8

lib/gis/datumtransform.table

@@ -82,9 +82,9 @@ ngo48   "towgs84=278.3,93.0,474.5,7.889,0.050,-6.610,6.21" "Norway" "Accuracy ab
 sam69   "towgs84=-60.0,-2.0,-41.0" "Brazil" " "
 sam69   "towgs84=-77.0,3.0,-45.0" "South America?" "Old GRASS sam69 parameters"
 nad27   "towgs84=-9.0,151.0,185.0" "Alaska & Canada" "Old GRASS a-can parameters"
-# http://www.linz.govt.nz/rcs/linz/pub/web/root/core/SurveySystem/GeodeticInfo/Software/softwaredownloads/index.jsp
+# http://www.linz.govt.nz/geodetic/conversion-coordinates/geodetic-datum-conversion/nzgd1949-nzgd2000/distortion-grid/
 nzgd49  "nadgrids=nzgd2kgrid0005.gsb"  "New Zealand"   "LINZ NZGD49 NTv2 Distortion Model, accuracy 10-30cm" 
-# http://www.linz.govt.nz/rcs/linz/6149/osgpol97_3.pdf
+# http://www.linz.govt.nz/geodetic/conversion-coordinates/geodetic-datum-conversion/nzgd1949-nzgd2000/three-and-seven-parameter/
 nzgd49  "towgs84=59.47,-5.04,187.44,0.47,-0.1,1.024,-4.5993" "New Zealand" "Accuracy approx. 4m"
 tokyo   "towgs84=-147.54,507.26,680.47" "Japan" " "
 tokyo   "towgs84=-147,506,687" "South Korea" " "