libgis: units defined here and in ../proj/units.table

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@61809 15284696-431f-4ddb-bdfa-cd5b030d7da7

lib/gis/proj3.c

@@ -127,6 +127,7 @@ double G_database_units_to_meters_factor(void)
     double factor;
     int n;
 
+    /* TODO: note the definitions in ../proj/units.table */
     static const struct
     {
 	char *unit;