Fix #978 -- Allow to split names (#1049)

- [x] attendee names
- [x] Invoice address names
- [x] Data migration
- [x] API serializers
  - [x] orderposition
  - [x] cartposition
  - [x] invoiceaddress
  - [x] checkinlistposition
- [x] position API search
- [x] invoice API search
- [x] business/individual required toggle
- [x] Split columns in CSV exports
- [x] ticket editor
- [x] shredder
- [x] ticket/invoice sample data
- [x] order search
- [x] Handle changed naming scheme
- [x] tests
- [x] make use in:
  - [x] Boabee
  - [x] Certificate download order
  - [x] Badge download order
  - [x] Ticket download order
- [x] Document new MySQL requirement
- [x] Plugins

doc/admin/installation/general.rst

@@ -21,6 +21,9 @@ To use pretix, you will need the following things:
 
   .. warning:: Do not ever use SQLite in production. It will break.
 
+  .. warning:: We recommend **PostgreSQL**. If you go for MySQL, make sure you run **MySQL 5.7 or newer** or
+               **MariaDB 10.2.7 or newer**.
+
 * A **reverse proxy**. pretix needs to deliver some static content to your users (e.g. CSS, images, ...). While pretix
   is capable of doing this, having this handled by a proper web server like **nginx** or **Apache** will be much
   faster. Also, you need a proxying web server in front to provide SSL encryption.