started to add static (fixed if) statement based decision rules based on gigE numbers
added mca params so that a user can force a certain algorithm/segment/topo on a per collective basis
(this is not in the fixed call path but only in the dynamic (at com create) call path).
(these params can be used by test suites such as OCC to choice which algorithm they are using).
This commit was SVN r7854.
(actually a work around for an optimisation in the reduce for not saving ops on the first recv of each segment)
Minor change in topo.
This commit was SVN r7758.
