changes to make it possible to use Cython for improved performance #877
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when someone (like me g) is using Cython for performance reasons it is not possible because the argument-name 'signed' is a reserved keyword in C.
renamed (the unused) argument "signed" to "is_signed" (this name is already used inside canmatrix on all compareable locations).
also remove un-reachable "break" after "return" to avoid compiler-warnings.