Just upgrade my installation of Calibre to version 2.31, 64bit.
New Features of v2.31
E-book viewer: Make the search engine used for searching for selected text configurable (in the Miscellaneous section of the viewer preferences)
New Features of v2.30
- An option to auto-convert a book on adding even if it is already in the output format (Preferences->Adding Books).
- E-book viewer: If there are entries in the Table of Contents that are long enough to be truncated, display the full text in a popup menu when the mouse hovers over the item.
- News download: Add support for turning off SSL certificate verification in individual recipes
- Kobo driver: Support for upcoming firmware version 3.16