String: @re: catch “invalid group reference” exceptions. (Fixes second issue of GH-824.)
Misc: Fix typo in l10n-fr.
NickAuth & User: Fix nick auth + gpg auth when secure flag is on. Closes GH-825.
Add support for SASL EXTERNAL
Merge pull request #826 from nyuszika7h/sasl-external

Add support for SASL EXTERNAL
User: Fix @gpg remove with some gpg configs.
src/irclib.py: fix typo causing an error on 904
Later & Seen: Fix neutral grammar in l10n-fr.
Socket: catch connection errors.