Improve wot view

• Display membership status:
  • member?
  • sentry?
  • outdistanced?
  • excluded?
  • revoked?
  • date of expiration of the membership document
  • date of expiration of the first of the five recent certifications
  • use a summary chart?

- [ ] rename wot (as wot would be the name of a tool to explore the wot) to membership alias ms (membership is also problematic as for sending membership document).

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• Display whether certifications have been written into the blockchain or if it's into the sandbox. From /wot/requirents/<pubkey>.
• display certification stock