Post-Upgrade Activities
-----------------------
1. Check .htaccess settings (some php settings could become required)
2. If you're using the built-in addressbook, run indexing script:
   ./bin/indexcontacts.sh.
3. When upgrading from version older than 0.6-beta you should make sure your
   folder settings contain a namespace prefix if necessary. For example Courier
   users should add “INBOX.” prefix to folder names in main configuration file.
4. Check system requirements in INSTALL file.
5. If you previously installed plugins through composer, update dependencies by
   running:
   php composer.phar self-update
   php composer.phar update --no-dev
6. Update your database and configurations by running:
   ./bin/update.sh
7. Update the cached javascript libraries by running:
   ./bin/install-jsdeps.sh

SQLite database upgrade
-----------------------
Versions older than 0.9 were supporting SQLite v2 only. Newer versions require
database in v3 format. The best what you can do is to convert database file
to the new format using command line tools:

sqlite OLD.DB .dump | sqlite3 NEW.DB
