VOResource: Miscellaneous Changes

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VOResource Miscellaneous Changes

• Add optional ltsecurtiyMethodgt to ltinterfacegt
• Has standardID attribute that identifies the
  specific method
• TLS authentication, digital signature, delegation
  service
• ltinterface xsitype""gt
• ltaccessURLgthttp//lt/accessURLgt
• ltsecurityMethod standardID"ivo//ivoa/security
  /digsig"/gt
• lt/interfacegt
• May be extended in future to provide more
  information
• We wish to start using this year