vb-aliases: make more code-completion-friendly

This replaces the VB_* macro aliases for proper macro-style functions,
making them more visible to IDEs

Change-Id: I00370930e8991c93dbcdc953bddab6cbfba95774
Reviewed-on: http://review.couchbase.org/35875
Reviewed-by: Brett Lawson <brett19@gmail.com>
Tested-by: Mark Nunberg <mnunberg@haskalah.org>