Cannot create tables in MySQL with InnoDB and UTF8mb4 using tables_mysql.sql

[krrg]

InnoDB has a maximum size of 767 bytes on a single column index. When using a VARCHAR(200) as one of the columns in a multicolumn primary key, this limit still is in force.

When the character encoding is set to UTF8mb4, the VARCHAR(200) data type required 800 bytes, which is greater than the allowed 767 by InnoDB.

This should be easy to fix by reducing the VARCHAR(200) columns to VARCHAR(190) columns, which will fit inside the 767 byte limit with any encoding that uses 4 bytes or less.

For limitations on InnoDB, see http://dev.mysql.com/doc/refman/5.6/en/innodb-restrictions.html

[jhouserizer]

See #7

[zemian]

PR merged.