• Fix: Plugin version was not shown in about window for tarball installations
• Fix: Collation behavior was case-insensitive for MySQL (only). Now unified across the different supported DBMS.
• Fix #306: With MySQL, sync failure could occur when several custom labels where used that only differed in case
  (effect of previous issue).
• Fix #308: With SQLite, the initial sync after adding a new addressbook was not automatically triggered.