Fix Errors with FB2sax parser. Unify FB2 and FB2Sax working. Update tests in test_scan.py.

        def add_author_from_node(node):

            first_name = subnode_text(node, 'first-name')

            middle_name = subnode_text(node, 'middle-name')

            #middle_name = subnode_text(node, 'middle-name')

            last_name = subnode_text(node, 'last-name')

            self.__add_author__(' '.join([first_name, middle_name, last_name]), last_name)

            self.__add_author__(' '.join([first_name, last_name]), last_name)

        res = tree.xpath('/fb:FictionBook/fb:description/fb:title-info/fb:author', namespaces=self.__namespaces)

        if len(res) == 0:

          self.lang.tagopen(name)

          self.book_title.tagopen(name)

          self.annotation.tagopen(name)

          self.docdate.tagopen(name)

          self.docdate.tagopen(name,attrs)

          self.series.tagopen(name,attrs)

          if self.rc!=0:

             if self.cover_name.tagopen(name,attrs):

        except StopIteration:

            pass

        except Exception as err:

            print(err)

            self.parse_errormsg=err

            self.parse_error=1

        self.file.seek(0, 0)

        self.fb2parser.parse(self.file)

        if self.fb2parser.parse_error != 0:

            raise FB2StructureException('FB2sax parse error')

            raise FB2StructureException('FB2sax parse error (%s)'%self.fb2parser.parse_errormsg)

        self.__detect_title()

        self.__detect_authors()

        self.__detect_tags()

        return None

    def __detect_docdate(self):

        res = ''

        if len(self.fb2parser.docdate.getvalue()) > 0:

        res = self.fb2parser.docdate.getattr('value') or ''

        if len(res)==0 and len(self.fb2parser.docdate.getvalue()) > 0:

            res = self.fb2parser.docdate.getvalue()[0].strip();

        if len(res) > 0:

            self.__set_docdate__(res)

                    for a in book_data.authors:

                        author_name = a.get('name','Unknown author').strip(strip_symbols)

                        # Если в имени автора нет запятой, то фамилию переносим из конца в начало

                        if author_name.find(',')>=0:

                        if author_name.find(',')<0:

                            author_names = author_name.split()

                            author_name = ' '.join([author_names[-1],' '.join(author_names[:-1])])

                        author=opdsdb.addauthor(author_name)