title: Domain filter with '&' doesn't work in openerp7
body: <p>Below is what i need to do</p>
  
  <pre><code>(Condition A and Condition B) or Condition C
  
  (partner_id = partner_id **and** user_ids = context.get(uid)) **or** userid = 1
  </code></pre>
  
  <p>The possible domain filters i've tried are</p>
  
  <pre><code>domain="['|',('user_ids','=',1),'&amp;',('partner_id','=',partner_id),('user_ids','=',context.get('uid'))]"
  
  domain="['|','&amp;',('partner_id','=',partner_id),('user_ids','=',context.get('uid')),('user_ids','=',1)]"
  </code></pre>
  
  <p>Nothing works out and the error i get is below</p>
  
  <pre><code> File "D:\workspace\Techtalk\openerp\modules\loading.py", line 76, in &lt;lambda&gt;
     load_data = lambda *args: _load_data(cr, *args, kind='data')
   File "D:\workspace\Techtalk\openerp\modules\loading.py", line 124, in _load_data
     tools.convert_xml_import(cr, module_name, fp, idref, mode, noupdate, report)
   File "D:\workspace\Techtalk\openerp\tools\convert.py", line 941, in convert_xml_import
     doc = etree.parse(xmlfile)
   File "lxml.etree.pyx", line 2698, in lxml.etree.parse (src/lxml/lxml.etree.c:49590)
   File "parser.pxi", line 1513, in lxml.etree._parseDocument (src/lxml/lxml.etree.c:71423)
   File "parser.pxi", line 1543, in lxml.etree._parseFilelikeDocument (src/lxml/lxml.etree.c:71733)
   File "parser.pxi", line 1426, in lxml.etree._parseDocFromFilelike (src/lxml/lxml.etree.c:70648)
   File "parser.pxi", line 997, in lxml.etree._BaseParser._parseDocFromFilelike (src/lxml/lxml.etree.c:67944)
   File "parser.pxi", line 539, in lxml.etree._ParserContext._handleParseResultDoc (src/lxml/lxml.etree.c:63820)
   File "parser.pxi", line 625, in lxml.etree._handleParseResult (src/lxml/lxml.etree.c:64741)
   File "parser.pxi", line 565, in lxml.etree._raiseParseError (src/lxml/lxml.etree.c:64084)
  XMLSyntaxError: xmlParseEntityRef: no name, line 144, column 12
  </code></pre>
  
  <p>Links i've refered are</p>
  
  <p><a href="http://help.openerp.com/question/2170/domain-notation-using-multiple-and-nested-and/" rel="nofollow noreferrer">http://help.openerp.com/question/2170/domain-notation-using-multiple-and-nested-and/</a></p>
  
  <p><a href="https://stackoverflow.com/questions/16276155/openerp-ver-7-domain-filter-with-more-conditions">OpenERP ver 7 Domain filter with more conditions</a></p>
  
  <p><strong>Additional Notes</strong>
  I could not find a single domain filter with &amp; operator in openerp source.</p>
  
  <p>Am i missing something? Kindly suggest. Thanks for your time.</p>