tables not prefixed in various files.

Hello !
I'm trying to install and use this module on a multi-site configuration and found some errors in the code.
I'm no drupal developper, but I hope that the informations I'll give you will be helpfull !
First of all, in merci.module,
the query line 3114 of merci.module lacks {} between table names (merci_reservation_detail).
Line 1007, I've replaced return $item_settings + $content_settings; with
return $item_settings . $content_settings; (operation from incompatible types) I'm not sure about this correction.

Next, in modules/merc_ui/merci_ui.module there are {} missing also.
Line 172 and line 191.

That's all for now, and I hope it will help