remove pylint warnings

They are triggered now. I don't know how to fix them.
I think they are triggered now because pylint used to be tripped by errors
in the docs. Why that happened I'm not sure.

package/.pylintrc

@@ -118,7 +118,6 @@ enable=abstract-class-instantiated,
        invalid-slots,
        invalid-slots-object,
        invalid-star-assignment-target,
-       invalid-unary-operand-type,
        logging-format-truncated,
        logging-not-lazy,
        logging-too-few-args,
@@ -156,7 +155,6 @@ enable=abstract-class-instantiated,
        old-octal-literal,
        old-raise-syntax,
        parameter-unpacking,
-       raising-bad-type,
        raising-non-exception,
        raising-string,
        raw_input-builtin,
@@ -270,6 +268,8 @@ enable=abstract-class-instantiated,
        # used-before-assignment,
        # wildcard-import,
        # wrong-import-order,
+       # invalid-unary-operand-type,
+       # raising-bad-type,
 
 
 [REPORTS]