check-code: concatenate "check-code" on compile time The python compiler concatenates two string constants. Use this instead of doing it on run time or instruct the user how to do it. The strings "no-check-code" and "check-code-ignore" has to be specially written for not skipping some checking of the code of this file.

tests: do not skip code-checking on some whole files In filterpyflakes the term no-check-code was probably by accident. In the test the intention was not to skip the entire file but only one line. But any skipping seems to be unnecessary since a longer time.