BibEdit: exhanced Tickets panel
- Changed the Tickets box in templates so that even the title (Tickets) is shown only if there is ticket support.
- The Tickets box will contain an error message in <-- --> comments otherwise.
- New options in the Tickets box: read/close/new ticket.
- In BibCatalog, fixed a bug in scanning the ticket number (try/except).
- In BibCatalog, added an option include_resolved in searching tickets. The default is False, thus resolved tickets are not returned.