request bookmarks via XML if server announce it supports pubsub but doesn't answer in the next 30 seconds. Fixes #5198

If the number of connected resources is appended in parentheses,
the appropriate ltr or rtl mark is inserted before, so that the
writing direction at the end of the nickname matches the writing
direction of the whole displayed string as determined by
http://www.unicode.org/reports/tr9/#The_Paragraph_Level

don't remove a file before renaming under windows because os.remove('test') will remove 'TEST' under window. Fixes #5279