SimpleSignEdit

Fixed a few SQL errors.

Quote from 1.7 changelog:

You must specify the database details before starting up your server for the first time with SimpleSignEdit 1.7; if you do not, SimpleSignEdit will default to using an SQLite database and convert all the keys from the config.yml to the database format, then remove them from the config. If you wish to later switch database types, you will need to convert the database yourself.

It is possible (though unlikely) that some databases will cause an error to be raised at startup saying something similar to "table already exists". If this occurs, you may ignore it; it simply indicates that the database's standard compliance with respect to error reporting is defective, thus preventing the plugin from suppressing an error that is known to be a non-issue.