Bug Fixes:
I#416 - LDAP: Possible memory leak in build_mods_from_contacts()
I#417 - Serialize OAuth2 token refresh for an account
I#418 - locale_supports_12_hour_format() can read uninitialized value
I#419 - IMAP: Does not forget renamed folders on the server
I#420 - LDAP: Use valid values for error paths of contact create/remove
I#421 - libedataserver: Enhance two-digit year parsing
I#427 - Tautology in e_named_parameters_equal()
I#428 - Addressbook: Fix possible read of uninitialized data
I#429 - Fix some (rarely) possible dereferences of NULL
