Updated the default BZURL, so that it will be a link (see BZ#976133) and also so it incorporates, the BZProduct, BZComponent and BZVersion values if specified.
Fixed BZ#977581, so topics with whitespace only are still declared as empty topics.
Added the ability to build a book without the "Version" content spec metdata and fixed a bug in the BZURL generated entity.
Fixed BZ#977587, default Revision History is included in Translated Revision Histories.