- changed trace facility to append to a variable to minimize interactions for results and return codes, which happen via nsf::log. - added more convenient function for adding to DStrings: Nsf_DStringPrintf - renamed NsfDStringPrintf to NsfDStringVPrintf - replaced complex macros for tracing by functions
- add NsfArgumentError() to stub interface, since this might be used by c packages using the interface generator - add mong::json to the interface - bump version number for mongo interface to 0.4.