Remove the deprecated fehler module from color; adjust gray values

(from dev 3b91484c1049)

sks/color/color.py

@@ -4,11 +4,11 @@ import kutil
 
 class Color(klammer_base.Klammer_base):
     def __init__(self, K):
-        kutil.msg()
+        # kutil.msg()
         super().__init__(K)
         match = re.compile(r'([0-9.]+)\s*,\s*([0-9.]+)\s*,\s*([0-9.]+)', re.S).match(self.rgb)
         if not match:
-            raise fehler.KlammertextError(
+            raise Exception(
                 'Error in color format: "{}".  '.format(K.rgb)
                 + 'Should be "<r>,<g>,<b>", where the components are [0,1].')
         self.r, self.g, self.b = [float(c) for c in match.groups()]

sks/color/sty/color.sty

@@ -1,7 +1,7 @@
 \usepackage[table]{xcolor}
 
-\definecolor{Gray}{gray}{.85}
-\definecolor{LightGray}{gray}{.95}
+\definecolor{Gray}{gray}{.7}
+\definecolor{LightGray}{gray}{.9}
 \definecolor{White}{gray}{1}
 \definecolor{Red}{rgb}{1,0,0}
 \definecolor{Darkred}{rgb}{.5,0,0}