Reduced index length to work ok on mysql 5.6.

Conflicts:
	scripts/database/otrs-schema-post.mssql.sql
	scripts/database/otrs-schema-post.mysql.sql
	scripts/database/otrs-schema-post.oracle.sql
	scripts/database/otrs-schema-post.postgresql.sql
	scripts/database/otrs-schema-post.postgresql_before_8_2.sql
	scripts/database/otrs-schema.mssql.sql
	scripts/database/otrs-schema.mysql.sql
	scripts/database/otrs-schema.oracle.sql
	scripts/database/otrs-schema.postgresql.sql
	scripts/database/otrs-schema.postgresql_before_8_2.sql