Add command line arguments to the command line for blist test application.
-r val seeds a random number generator with val
-h val sets the max number of live allocations during the startup phase to val
-n val sets the number of add/free events during the startup phase to val
During startup, ranges are allocated and freed randomly from the blist. An allocation is of random size. The kind of event, alloc or free, is determined randomly by picking a position in the array of live allocations, and if there is a live allocation there, deleting it. Otherwise, a new allocation is attempted and, if successful, added to the array of live allocations. If an operation fails during startup, a panic should stop the program.
After startup, the program runs as before, but with some blocks allocated.