CHG: added warning so that people start using cuffey, which is more accurate for warmer ice

Author: MathieuMorlighem

src/m/materials/paterson.m

@@ -7,6 +7,8 @@
 %   Usage:
 %      rigidity=paterson(temperature)
 
+warning('paterson is outdated, please consider using cuffey instead')
+
 if any(temperature<0)
 	error('input temperature should be in Kelvin (positive)');
 end

src/m/materials/paterson.py

@@ -13,6 +13,8 @@ def paterson(temperature):
         rigidity = paterson(temperature)
     """
 
+    print('paterson is outdated, please consider using cuffey instead')
+
     if np.any(temperature < 0.0):
         raise RuntimeError('input temperature should be in Kelvin (positive)')