Improve installation procedure and reduce SQL limitations

unconditional part of post-install and postConfigure should be run automatically by package manager

uninstallation should shutdown the "system" and stop all columnstore processes

purge should delete all data

should use systemd/sysv as the mariadb server

ideally should work like a normal plugin

ideally shouldn't ssh into other hosts for cluster management

From the meeting in Frankfurt:

• ALTER TABLE ENGINE=COLUMNSTORE
• CREATE TABLE AS SELECT
• COLLATION should not result in an error, a warning should be added
• remove auto_increment implementation for ColumnStore
  • Test SEQUENCES to replace this