Fix number field search

Search with non numeric content will not hit number field (it breaks elasticsearch and is useless anyway)

- Rename QueryHelper::buildPrivateFieldQueries() to wrapPrivateFieldQuery().
    - Signature changed too, the third parameter is dropped an QueryContext is replaced by an array of Field.
    - Query builder closure is now passed an array of Field, not of index field names.
- Remove Field::toConceptPathIndexFieldArray() because method name was beyond understanding (and also because it wasn't needed anymore)
- Various AST node types have changed due to previous API changes

tests/Alchemy/Tests/Phrasea/SearchEngine/AST/QuotedTextNodeTest.php

@@ -23,9 +23,11 @@ class QuotedTextNodeTest extends \PHPUnit_Framework_TestCase
 
     public function testQueryBuild()
     {
+        $field = new Field('foo', Mapping::TYPE_STRING, ['private' => false]);
         $query_context = $this->prophesize(QueryContext::class);
-        $query_context->getLocalizedFields()->willReturn(['foo.fr', 'foo.en']);
+        $query_context->getUnrestrictedFields()->willReturn([$field]);
         $query_context->getPrivateFields()->willReturn([]);
+        $query_context->localizeField($field)->willReturn(['foo.fr', 'foo.en']);
 
         $node = new QuotedTextNode('bar');
         $query = $node->buildQuery($query_context->reveal());
@@ -50,11 +52,14 @@ class QuotedTextNodeTest extends \PHPUnit_Framework_TestCase
         ]);
 
         $query_context = $this->prophesize(QueryContext::class);
+        $query_context
+            ->getUnrestrictedFields()
+            ->willReturn([$public_field]);
         $query_context
             ->getPrivateFields()
             ->willReturn([$private_field]);
         $query_context
-            ->getLocalizedFields()
+            ->localizeField($public_field)
             ->willReturn(['foo.fr', 'foo.en']);
         $query_context
             ->localizeField($private_field)