removing D6 files

  - patch by @CkPoMHbIu removed an error on deletion issue #624172
  - patch by @agileware provides update support by implementing batch api issue #805244 and the delta count patch in issue #805244
  - wrong delta count fixed #672732
  - checkbox length issue fixed #558612
  - php foreach error fixed #811738
  - doubling references issue #800054 fixed
  - php notices issue #917236

Saving message added

create branch 'DRUPAL-6--4'.

Sprout from master 2010-05-07 11:09:27 UTC Dominique De Cooman <domidc@199987.no-reply.drupal.org> 'applied patch http://drupal.org/files/issues/cnr-730986-10.patch'
Delete:
    .project

when a reference has multiple content types allowed to reference to another and multiple other references on other content types reference to this field.
There is now a check in place so a reference instance can not link more than one time to a node for the current node.

multiple add more autocomplete prevention
call byreference removed

performance loss fixed
bug fix for noderefs on same node

avoiding php warning in foreach on line 53