Fixed gcc 4.3 compile issues

- Attributes are now organized by the attribute type (i.e. one can add more
  LDAPAttribute-Objects with the same type without violating the X.500 data
  model)

stuff). See also ITS#1322

Gohman)

- extented Referral chasing (loop detection, hop limit, Rebind)
- support for Server Controls
- fixed many bugs and memory leaks

Copyright notices have been adjusted per on-file OpenLDAP Contributor
Assignment Agreement.