(Bug 3994) : New "deleted account" page

* Shows an initial paragraph according to your relationship with the
   account and whether it is a community

* Shows the reason for deletion if there is one

* Shows the bit about being notified upon purge if you are logged in and
   are not the owner/admin.
(Bug 3994) : Don't offer to track protected usernames.
(Bug 3994) : Now show "relationship text" & link.

If the user has granted access to or subscribes to or is a member of
the deleted account, tell them this and offer a link to change that.
(Bug 3994) : Tidied up indents, removed trailing spaces
(Bug 3994) : Changes as requested in code review

* Cleanup of spaces & linebreaks

* Changed $dbr to $dbcr

* Only look up the deleter in the db when it's a community

* Tweak to page formatting
(Bug 3994) : Changed interpolated variables to bound params in db query
(Bug 3994) : Corrected SecurityAttributeChanged.pm for best practice as per pull request comments

* Changed $dbr to $dbcr for cluster reader

* Changed interpolated variables to bound parameters in db query.
Merge pull request #195 from swaldman3/3994_deleted_account_pages

Bug 3994 : deleted account pages