peerplays_migrated/tests/random

options:
 -R test standard 'rand' instead of 'get_random_bits';
 -A run all dieharder tests, default is to run only selected tests.

conclusion:
 quality of randomness of 'get_random_bits' is comparable with randomness standard 'rand' function, 
 however about an order of magnitude slower than 'rand';
 and distinctly weaker compared to e.g. /dev/urandom that is assessed by dieharder as almost perfect.