I don't see any sense, why infinite shops should exist. They are
basically the same as admin shops, except that money gets withdrawn from
the vendor for something he doesn't even get or money gets deposited to
the vendor for something that he sold, but didn't even have.
Also the possibility to convert the database column 'infinite' to
'shoptype' has been removed, so server owners, who update from a version
below 1.7.1 first have to download a version below 1.8.0 to let the
resource convert the database columns.
Admin Shops are basically the same as infinite shops, but the vendor
won't get money and won't get a message if someone bought from or sold
to it.
As I rewrote the buy and sell methods, I also fixed a bug that you had
to pay even though you didn't have enough space in your inventory and
that the vendor had to pay even though his shop's inventory was full
