Include postcode pattern in postcode normalisation regex, instead of
removing it from postcode pattern in config.
It properly handles postcode validation and normalization when country code
is part of the postcode, e.g. for Isle of Man, Jersey, Anguilla, Andorra,
Cayman Islands and more.
Fixes#3227.
Moves postcodes that are either in countries without a postcode
system or don't correspond to the local pattern for postcodes into
a field for a normal address part. Makes them searchable but not as
a special address. This has two consequences: they are no longer a
skippable part of the address and the postcodes cannot be searched
on their own.
