• constant_inc.php: add some errors for LDAP stuff
• core/authentication_api.php
  (auth_does_password_match): call ldap_authenticate() for ldap auth
• core/ldap_api.php: rewrite of ldap api
• doc/README.LDAP: update example config settings
• lang/strings_english.txt: add strings for the new LDAP errors

This is a rewrite of the LDAP api by Robert Foster rfoster@mountainvisions.com.au

I cleaned up quite a few things (mostly variable names and spacing) in ldap_api before committing and this hasn't been tested by me since I don't use LDAP. So if I broke it, patches welcome! :)

git-svn-id: http://mantisbt.svn.sourceforge.net/svnroot/mantisbt/trunk@1636 <a class="text" href="/?p=mantisbt.git;a=object;h=f5dc347c">f5dc347c</a>-c33d-0410-90a0-b07cc1902cb9