Improve PubSec authfile formats handling, test, document
Following #273 (closed) and #278 (closed):
- check compatibility with Cesium's and Duniter's PubSec format
- Add PubSec compatibility to the regex in DuniterPy
- Write tests for PubSec authfile formats into DuniterPy
- Import DuniterPy regex for filtering the authfiles in Silkaj
- #271: document accepted authfile formats
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