Improve wot view
- [x] 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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- [x] Display whether certifications have been written into the blockchain or if it's into the sandbox. From `/wot/requirents/<pubkey>`.
- [x] display certification stock
issue