Views random seed settings

Adds a random order handler with seed. If a constant integer argument N is specified in the sql RAND() function, it is used as the seed value, which produces a repeatable sequence of column values. This makes it possible to have paging and not having items show up twice.
It's also possible to compute a custom seed using PHP, allowing you to create pseudo randoms numbers based on variables such as the date of the day.

More info:
- MySQL: about RAND() and the optional integer argument.
- PostgreSQL: about RANDOM() and the 'select setseed' function.

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