* add find algorithm for convolution without extra padding

* Use cudnnFind* or cudnnGet* depending on tuning param boolean. Add select function to search the perf results of the cudnn queries.

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* Algo search no longer binary, now it is either off, a heuristic search (cudnnGet*) or an explicit search (cudnnFind*).

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* switch to explicit.

* Throw if no suitable cudnn algo found.

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