#65 Instead of 'update+insert into', generat a script with 'replace into' statements. (MySQ)

[Ralf Wisser]

see https://sourceforge.net/p/jailer/discussion/700499/thread/ef50a8b4c2/

[Ralf Wisser]

The 'replace into' statement is not suitable for this purpose because its effect depends on which key the table has in the target database. If this key differs from a manually defined one (especially if it does not exist), the result is incorrect.

Instead, I changed the way how the 'upsert' statements are generated to include multiple rows per statement. This makes the script more compact.