mersenne_twister misses header

[nobody]

On my GCC 3.2 installation, the mersenne_twister.hpp 
fails to compile when <iterator> isn't previously 
included. This is the case in random_demo and 
random_test but not random_speed, so it slipped 
through the test suite.

[jmaurer]

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user_id=53943

This has been fixed in the 1.29 release branch.

The main branch has major rework and no longer
needs <iterator>, I think.