(main, init_server, emp_server.6): Add -R command line option to set

(main, init_server, emp_server.6): Add -R command line option to set
a seed for the random function.

(nightlybuild.sh): Add the -R 1 for the server.
(nightlybuild.sh): Switch to -R 1 for the fairland as 1 is safer.
Some systems might generate lousy randomness from a
zero seed.

(prng.patch): Not required anymore, -R 1 is used instead.

(main, emp_server.6): Rename -r and -R to -u and -U.  "-R" is now used for random seed.