add some import-export tests
fix export of lists with bullets; <li> are closed before the next list starts. also, when closing, ensure that list-items are not nested
close and open lists according to the actual line.listLevel
fix bullet test case, remove indent-testcases because they are in separate file
fix closing of lists
Merge pull request #2417 from webzwo0i/fix-export

Fix ExportHtml.js list parsing code