[SAGA-RG] SAGA Message API Extension

Hi Folx , here is the updated draft of the SAGA Message API, in preparation for OGF-19. It is also available in CVS, as usual. We would be happy to get feedback on the list of course, so don't feel oblidged to hold back your comments for OGF-19 :-) Cheers, Andre. -- "So much time, so little to do..." -- Garfield