PowerAdmin InnoDB Migration

This change makes PowerAdmin work with InnoDB alone, a much better
option in terms of data-safety and database management.
Merge branch 'poweradmin-innodb-conversion' of github.com:luismottacampos/poweradmin into poweradmin-innodb-conversion

Conflicts:
	sql/poweradmin-mysql-db-structure.sql
	sql/powerdns-dnssec-mysql-db-structure.sql
	sql/powerdns-mysql-innodb-migration-script.sql