add support for escaping newlines...

print which character we don't know how to escape to make adding
new supoprt easier..

[git-p4: depot-paths = "//depot/": change = 1671]

cdrtoc.py

@@ -25,8 +25,11 @@ def decodestrend(i, pos):
 			elif c in string.digits:
 				r.append(unichr(int(i[bspos + 1:bspos + 4], 8)))
 				pos = bspos + 4
+			elif c == 'n':
+				r.append('\n')
+				pos = bspos + 2
 			else:
-				raise ValueError('unknown escape char')
+				raise ValueError('unknown escape char: %s' % `c`)
 		else:
 			r.append(i[pos:dqpos])
 			break