[ogsa-wg] use case template

Hi, attached ios the SAGA use case template, as asked for in todays phone call. Please note that we (i.e. the SAGA folx) would draft a simplier use case template iff we'd do that again, because, in hindsight, we asked too many questions which were not related to the API. OTOH, for your purpose, the question may just be right... ;-) Best, Andre. -- One week of hacking easily saves half an hour of thinking. Henri Bal