Delete all entitytags of a contact in a single api call

If we do not define a tag_id, all entitytags related to a contact_id should be removed, eg.:

$result = civicrm_api3('EntityTag', 'delete', array(
'contact_id' => -contact-id-,
));

This needs the following changes:

In getContactTags() of CRM/COre/BAO/EntityTag.php two changes:

$select = "SELECT name ";

becomes:

$select = "SELECT ct.id, ct.name ";

---

while ($dao->fetch())

{ $contactTags[] = $dao->name; }

becomes:

while ($dao->fetch())

{ $contactTags[$dao->id] = $dao->name; }

In _civicrm_api3_entity_tag_common of api/v3/EntityTag.php:

if (empty($tagIDs))

{ return civicrm_api3_create_error('tag_id is a required field'); }

becomes:

if (empty($tagIDs)) {
if ($op == 'remove')

{ $tagIDs = array_keys(CRM_Core_BAO_EntityTag::getContactTags($entityIDs[0])); }

else

{ return civicrm_api3_create_error('tag_id is a required field'); }

}