Minor API change to default one parameter.
Minor API change to default one parameter.

git-svn-id: d0dba01034cd03709084dc2e161d1284e188ee71@127 72e31ff3-66e1-0310-9094-9c83e53ae81d

adieu/vobject,eventable/vobject,tBaxter/vobject,Kurmaev/vobject,svn2github/vobject