Don't rely on plugin_basename( WP_STREAM_DIR ) to define the db versions option_name

[c3mdigital]

Working on #387 I realized that if the plugin directory changes for any reason and you update no previous stored version will be found because we are defining and querying for the option_name using plugin_basename( WP_STREAM_DIR ) . '_db';

If a user downloads the zip from git_hub the directory will be wp-stream-xxxxx where xxxxx is either the branch or tag. If the user updates to a newer version via the dashboard the stream tables could be overwritten.

I think we should just define as a constant somewhere and use the same prefix as the settings wp_stream_db. We would have run a check for the old name somehow before migrating old installation to the new key. Maybe a $wpdb-> query for `option_name LIKE '%wp-stream%' or something.

[frankiejarrett]

@c3mdigital Really good thinking on this 👍