Regarding the API changes for libSBML-3.3
(i.e. the return type change on set/add functions)
In order not to destabilise the trunk of libsbml I propose creating a
branch of svn named 'new_api_3.3' which I will use exclusively for
making the changes to the return types and in some cases the
functionality of the set/add functions. Once these are all complete and
tested I will merge the branch back into the trunk.
Any bug fixes to existing code or additions to the existing API
will continue to go into the trunk.