[patch] SSAR interpolation loop

[Don McCoy]

This patch gets a 6x speedup in the interpolation loop over the previous 
version.  Again using the same methodology of pre-computing values where 
possible. 

The memory footprint is worth considering at this point.  For example, 
this computation stores a cube of 1072 x 1144 x 17 doubles for this 
particular problem size.  As the problem scales, the speedup may not be 
worth the trade-off in memory consumed.

Regards,

-- 
Don McCoy
don (at) CodeSourcery 
(888) 776-0262 / (650) 331-3385, x712

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