[patch] 2-D correlation

[Jules Bergmann]

This patch implements and tests 2-D correlation, with a simple C++ 
implementation.

Also in this patch:

  - Add test_assert(), which is essentially the same as assert(), but 
not disabled by defining NDEBUG.  This way our tests still check 
themselves even when the library is configured for performance.

  - Move error_db into its own header (tests/error_db.hpp) for common 
use (suggested by Don).

  - Element-wise "ite", similar to the "?:" operator.  For example:

	out = ite(bool_view, a_view, b_view);

    is equivalent to:

	out(i) = bool_view(i) ? a_view(i) : b_view(i);

  - Moved "reference" implementations of 1-D and 2-D correlation into 
tests/ref_corr.hpp.  This is similar to ref_matvec.  Doing this will 
make it easier to check the output of correlation in other contexts. 
For example, if we had a correlation benchmark, it could check values 
against the reference to make sure that optimizations were in fact correct.

				-- Jules
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