options_parse(): fixed parsing of values immediately following the option.

The "-n10" string was not properly parsed as "-n 10" but rather as "-n -1 -0"
even when "n" was properly declared as expecting an argument.
Turned gtk-gnutella into a random number server through the "random" command.
bsched_timer(): collect entropy from active reading schedulers.
download_start_reading(): collect entropy from HTTP server latency.
entropy_aje_inited(): switched to aje_rand_strong() for entropy_random().
shell_exec(): collect entropy each time a command is run.