Merge remote-tracking branch 'origin/work-fe2-maxime-deterministic-us…

…ername' into work-fe2-maxime-deterministic-username

# Conflicts:
#	fe2-android/app/src/main/java/com/github/dedis/popstellar/model/objects/security/PublicKey.kt
#	fe2-android/app/src/main/java/com/github/dedis/popstellar/ui/lao/digitalcash/DigitalCashIssueFragment.kt
#	fe2-android/app/src/main/java/com/github/dedis/popstellar/ui/lao/digitalcash/DigitalCashSendFragment.kt