The MCOMPAT BLOB and TEXT types (various sizes) aren't JDBC BLOB and CLOB

Since we do not yet have Blob and Clob functionality. Make them LONGVARBINARY and LONGVARCHAR instead. Fix mappings and tests for that.

Another side-effect of shunting TypeId out in the I_S types table is that MEDIUMINT now gives Types.INTEGER there, rather than OTHER. It was already okay internally.