- moved pml_base_send_request_t allocation to pml - provide capability to cache
requests on per ptl basis - and provide hooks for ptl to init/cleanup ptl
specific data cached on the request
- renamed request/fragment super fields
- added ptl_send i/f which is called by pml for the first fragment, the
ptl_put i/f is called for subsequent fragments of the same request
This commit was SVN r1745.