[patch] 2D convolution

[Jules Bergmann]

This patch implements and tests 2D convolution.  It provides both 
generic and IPP optimized implementations.  It doesn't provide a SAL 
implementation, but the dispatch should fallback to the generic version 
in this case.

IPP only provides full- and min-support convolutions.  Same-support 
convolution is implemented by first using IPP's min-support conv and 
then filling in the edges.

				-- Jules
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