Better error handling for passphrase cache if key is missing
API: User interaction when account keys are deleted
Fix tests
Fix tests
Fix tests
Move certify action down into actions section
Add user info dialog
Handle keys without expiry date right

Fixes #765
Dont write version header by default
Merge pull request #766 from mar-v-in/patch-1

Handle keys without expiry date right
API: Return metadata only for v4 api clients
API: Return metadata only for v4 api clients and above...
Remove support for v3 sig generation
Remove MD5 support
Do not import v3 keys, they are insecure!
move v3 key import prevention into canonicalization method