- several fixes in ev_sepoll
    - fixed some expiration dates on some tasks
    - fixed a bug in connection establishment detection due to speculative I/O
    - fixed rare bug occuring on TCP with early close (reported by Andy Smith)
    - implemented URI hashing algorithm (Guillaume Dallaire)
    - implemented SMTP health checks (Peter van Dijk)
    - replaced the rbtree with ul2tree from old scheduler project
    - new framework for generic ACL support
    - added the 'acl' and 'block' keywords to the config language
    - added several ACL criteria and matches (IP, port, URI, ...)
    - cleaned up and better modularization for some time functions
    - fixed list macros
    - fixed useless memory allocation in str2net()
    - store the original destination address in the session