Fix nodeacess and Subquery handling, and fix tests

Here is the patch and tests fixing it.

Here is the tests from #1 renamed as txt.

@Peter #3

I think the code:

$query1 = apachesolr_drupal_query('', 'uid:1 tid:5');
$query2 = apachesolr_drupal_query('', 'uid:10 tid:50');
$query2->add_subquery($query1, 'AND');
echo ($query2->get_url_querystring());

should produces (result of the patch #1):

filters=uid:10 tid:50 AND (uid:1 tid:5)

instead of (result of the patch #3):

filters=uid:10 tid:50 uid:1 AND tid:5

I think so because the code (notice I enter similar $keys instead of $filters param in apachesolr_drupal_query()):

$query1 = apachesolr_drupal_query('uid_1 tid_5');
$query2 = apachesolr_drupal_query('uid_10 tid_50');
$query2->add_subquery($query1, '', 'AND');
echo ($query2->get_query_basic());

produces:

uid_10 tid_50 AND (uid_1 tid_5)

P.S.
I'm thinking we should parenthesize the parent query as well:

(uid_10 tid_50) AND (uid_1 tid_5)

There are fixed tests.

Notes:

1. solr_base_query.test
It passes if you apply the patch Pure negative queries don't work

2. solr_base_subquery.test
It includes (commented) testStaticFactory() method intended to test apachesolr_current_query() static cache. But there is a problem.

$query1 = apachesolr_current_query('foo', '', '', TRUE); // TRUE to resert. $query1 is 'foo'
$query2 = apachesolr_current_query('bar', 'title:baz'); // $query2 is 'bar?filters=title:baz'

$query2->add_subquery($query1); // $query2 should be 'bar AND (foo)?filters=title:baz' or whatever

// What should be as a result of the next line?
// a) 'bar?filters=title:baz' (not altered $query2)
// b) 'bar AND (foo)?filters=title:baz' (altered $query2)
$query3 = apachesolr_current_query('bar', 'title:baz'); // $query3 IS 'bar?filters=title:baz'

The original test assumes option (b). Here I see option (a).
We shoud decide which approach to follow.

3. solr_index_and_search.test
The original one is based on search.module test so it cannot be used for testing dismax functionality.
It uses a query type 'standard'.
The dismax test will be created soon.