v2.10.1

• Do not excise any empty xmlns="" declarations by default. This behavior is now configurable as follows

  ```
  signer = XMLSigner()
  signer.excise_empty_xmlns_declarations = True
  signer.sign(...)
  ```
  ```
  verifier = XMLVerifier()
  verifier.excise_empty_xmlns_declarations = True
  verifier.verify(...)
  ```
  

  • Documentation and autoformatting improvements