Closes #254: If mb_string is installed then internationalised usernames are supported in file system.

Because of this I have raised mbstring from recommended to a (non-fatal) core requirement.

Because of the lack of a unicode ctype_alnum function the validation occurs at username input. Because of this I have improved the user registration code:

This code now validates for special chars etc in the username. I have also introduced the following new plugin hooks (which are run after primary validation) which provide plugins with the ability to add other requirements (extra security etc).

'registeruser:validate:password'
'registeruser:validate:username'
'registeruser:validate:email'

Marcus Povey 25/8/08

git-svn-id: https://code.elgg.org/elgg/trunk@2040 36083f99-b078-4883-b0ff-0f9b5a30f544

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