Improved error messages

testsuite/tests/numeric/should_compile/T7895.stderr

 
-T7895.hs:10:6: Warning: Literal 300 of type Word8 overflows
+T7895.hs:10:6: Warning:
+    Literal 300 is out of the Word8 range 0..255
 
-T7895.hs:13:6: Warning: Literal -129 of type Int8 overflows
+T7895.hs:13:6: Warning:
+    Literal -129 is out of the Int8 range -128..127

testsuite/tests/numeric/should_compile/T8542.stderr

 
 T8542.hs:6:6: Warning:
-    Literal 128 of type Int8 overflows
-    If you are attempting to write a negative literal, use NegativeLiterals
+    Literal 128 is out of the Int8 range -128..127
+    If you are trying to write a large negative literal, use NegativeLiterals
 
 T8542.hs:9:5: Warning:
-    Literal 128 of type Int8 overflows
-    If you are attempting to write a negative literal, use NegativeLiterals
+    Literal 128 is out of the Int8 range -128..127
+    If you are trying to write a large negative literal, use NegativeLiterals