Add safe(r) query abstraction

Add db_query_safe that accepts parameters separately. Use it in
some places.

Use db_connect() in some places

Don't handle full_special_chars default.filter

default.filter on this server is set to magic_quotes, so remove
the handling for the full_special_chars case.

Refactor long array() syntax to short []

Since app is using PHP 5.4+ already, the longer `array()` syntax can be
refactored to shorter `[]`.

Kill md5 and CVS fallbacks..

People that have never logged in since the move to SVN
Are effectively blocked out by this change and they'll have to reset their passwords.

Switch to default filtering

A little random cleanup (like mysql_real_escape_string() and htmlspecialchars()),
with some HTML too.
# Feel free to use filter().

Allow users to toggle their greylisting flag.
For more details, visit manage/users.php

probably is a better way to do this...

Sort addresses by domain.
Show count of quarantined mail

Add a bit more explanation about anti-spam measures.

Add a page to allow a user to review (and optionall punch an address through)
the C/R.